21102210100 has 36 divisors (see below), whose sum is σ = 45807318144. Its totient is φ = 8438022880.

The previous prime is 21102210067. The next prime is 21102210113. The reversal of 21102210100 is 101220112.

It is a super-2 number, since 2×21102210100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274077 + ... + 342523.

It is an arithmetic number, because the mean of its divisors is an integer number (1272425504).

Almost surely, 2^21102210100 is an apocalyptic number.

21102210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102210100 is an abundant number, since it is smaller than the sum of its proper divisors (24705108044).

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

21102210100 is a wasteful number, since it uses less digits than its factorization.

21102210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71544 (or 71537 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21102210100 its reverse (101220112), we get a palindrome (21203430212).

It can be divided in two parts, 211022 and 10100, that added together give a palindrome (221122).

The spelling of 21102210100 in words is "twenty-one billion, one hundred two million, two hundred ten thousand, one hundred".