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21220022100 = 22352292439083
BaseRepresentation
bin10011110000110011…
…111101011101010100
32000202212012210221110
4103300303331131110
5321424311201400
613425350415020
71350565132434
oct236063753524
960685183843
1021220022100
118aaa170752
124142661470
13200238c5c4
1410543482c4
15842e0de50
hex4f0cfd754

21220022100 has 72 divisors (see below), whose sum is σ = 63513747360. Its totient is φ = 5463543680.

The previous prime is 21220022077. The next prime is 21220022119. The reversal of 21220022100 is 122002212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1210842 + ... + 1228241.

It is an arithmetic number, because the mean of its divisors is an integer number (882135380).

Almost surely, 221220022100 is an apocalyptic number.

21220022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220022100 is an abundant number, since it is smaller than the sum of its proper divisors (42293725260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220022100 is a wasteful number, since it uses less digits than its factorization.

21220022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439129 (or 2439122 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21220022100 its reverse (122002212), we get a palindrome (21342024312).

The spelling of 21220022100 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred".

Divisors: 1 2 3 4 5 6 10 12 15 20 25 29 30 50 58 60 75 87 100 116 145 150 174 290 300 348 435 580 725 870 1450 1740 2175 2900 4350 8700 2439083 4878166 7317249 9756332 12195415 14634498 24390830 29268996 36586245 48781660 60977075 70733407 73172490 121954150 141466814 146344980 182931225 212200221 243908300 282933628 353667035 365862450 424400442 707334070 731724900 848800884 1061001105 1414668140 1768335175 2122002210 3536670350 4244004420 5305005525 7073340700 10610011050 21220022100