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21221201212100 = 2252747728381973
BaseRepresentation
bin1001101001100111100100…
…01010001111001011000100
32210010201121222222210002222
410310303302022033023010
510240142010002241400
6113044515114151512
74320116102035631
oct464636212171304
983121558883088
1021221201212100
11684195193761a
122468989422598
13bac1c60a3456
1453517c3d5188
1526c02aeb7185
hex134cf228f2c4

21221201212100 has 36 divisors (see below), whose sum is σ = 46056167141124. Its totient is φ = 8487344906880.

The previous prime is 21221201212061. The next prime is 21221201212109. The reversal of 21221201212100 is 121210212212.

It can be written as a sum of positive squares in 6 ways, for example, as 499204423936 + 20721996788164 = 706544^2 + 4552142^2 .

It is not an unprimeable number, because it can be changed into a prime (21221201212109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13443287 + ... + 14938686.

Almost surely, 221221201212100 is an apocalyptic number.

21221201212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221201212100 is an abundant number, since it is smaller than the sum of its proper divisors (24834965929024).

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

21221201212100 is a wasteful number, since it uses less digits than its factorization.

21221201212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28389464 (or 28389457 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221201212100 its reverse (121210212212), we get a palindrome (21342411424312).

The spelling of 21221201212100 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, one hundred".

Divisors: 1 2 4 5 10 20 25 50 100 7477 14954 29908 37385 74770 149540 186925 373850 747700 28381973 56763946 113527892 141909865 283819730 567639460 709549325 1419098650 2838197300 212212012121 424424024242 848848048484 1061060060605 2122120121210 4244240242420 5305300303025 10610600606050 21221201212100