21202112120 has 32 divisors (see below), whose sum is σ = 54519717600. Its totient is φ = 7269295488.

The previous prime is 21202112101. The next prime is 21202112153. The reversal of 21202112120 is 2121120212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21202112095 and 21202112104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37860635 + ... + 37861194.

It is an arithmetic number, because the mean of its divisors is an integer number (1703741175).

Almost surely, 2^21202112120 is an apocalyptic number.

21202112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202112120 is an abundant number, since it is smaller than the sum of its proper divisors (33317605480).

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

21202112120 is a wasteful number, since it uses less digits than its factorization.

21202112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75721847 (or 75721843 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202112120 its reverse (2121120212), we get a palindrome (23323232332).

The spelling of 21202112120 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, one hundred twenty".