21010222100 has 72 divisors (see below), whose sum is σ = 53786224128. Its totient is φ = 6971126400.

The previous prime is 21010222087. The next prime is 21010222127. The reversal of 21010222100 is 122201012.

It is a happy number.

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, 462407 + ... + 505806.

Almost surely, 2^21010222100 is an apocalyptic number.

21010222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010222100 is an abundant number, since it is smaller than the sum of its proper divisors (32776002028).

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

21010222100 is a wasteful number, since it uses less digits than its factorization.

21010222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968265 (or 968258 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21010222100 its reverse (122201012), we get a palindrome (21132423112).

The spelling of 21010222100 in words is "twenty-one billion, ten million, two hundred twenty-two thousand, one hundred".