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21222100221 = 371010576201
BaseRepresentation
bin10011110000111011…
…111000110011111101
32000210000010101120220
4103300323320303331
5321430324201341
613425503131553
71350621606210
oct236073706375
960700111526
1021222100221
119000360003
1241432a3bb9
13200293946a
141054729777
158431bea66
hex4f0ef8cfd

21222100221 has 8 divisors (see below), whose sum is σ = 32338438464. Its totient is φ = 12126914400.

The previous prime is 21222100183. The next prime is 21222100223. The reversal of 21222100221 is 12200122212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222100221 - 26 = 21222100157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222100223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505288080 + ... + 505288121.

It is an arithmetic number, because the mean of its divisors is an integer number (4042304808).

Almost surely, 221222100221 is an apocalyptic number.

21222100221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222100221 is a deficient number, since it is larger than the sum of its proper divisors (11116338243).

21222100221 is a wasteful number, since it uses less digits than its factorization.

21222100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010576211.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222100221 its reverse (12200122212), we get a palindrome (33422222433).

The spelling of 21222100221 in words is "twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred twenty-one".

Divisors: 1 3 7 21 1010576201 3031728603 7074033407 21222100221