21150253112120 has 128 divisors (see below), whose sum is σ = 51964967577600. Its totient is φ = 7683492633600.

The previous prime is 21150253112117. The next prime is 21150253112129. The reversal of 21150253112120 is 2121135205112.

It is a self number, because there is not a number n which added to its sum of digits gives 21150253112120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150253112129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2967619997 + ... + 2967627123.

It is an arithmetic number, because the mean of its divisors is an integer number (405976309200).

Almost surely, 2^{21150253112120} is an apocalyptic number.

21150253112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21150253112120 is an abundant number, since it is smaller than the sum of its proper divisors (30814714465480).

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

21150253112120 is a wasteful number, since it uses less digits than its factorization.

21150253112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12789 (or 12785 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21150253112120 its reverse (2121135205112), we get a palindrome (23271388317232).

The spelling of 21150253112120 in words is "twenty-one trillion, one hundred fifty billion, two hundred fifty-three million, one hundred twelve thousand, one hundred twenty".