21113022100 has 36 divisors (see below), whose sum is σ = 45838566144. Its totient is φ = 8440912480.

The previous prime is 21113022089. The next prime is 21113022193. The reversal of 21113022100 is 122031112.

It is a super-3 number, since 3×21113022100³ (a number of 32 digits) contains 333 as substring.

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, 147597 + ... + 253003.

It is an arithmetic number, because the mean of its divisors is an integer number (1273293504).

Almost surely, 2^21113022100 is an apocalyptic number.

21113022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113022100 is an abundant number, since it is smaller than the sum of its proper divisors (24725544044).

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

21113022100 is a wasteful number, since it uses less digits than its factorization.

21113022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107424 (or 107417 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21113022100 its reverse (122031112), we get a palindrome (21235053212).

The spelling of 21113022100 in words is "twenty-one billion, one hundred thirteen million, twenty-two thousand, one hundred".