21200102112120 has 64 divisors (see below), whose sum is σ = 65319233548320. Its totient is φ = 5500567033344.

The previous prime is 21200102112097. The next prime is 21200102112131. The reversal of 21200102112120 is 2121120100212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21200102112120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2387394447 + ... + 2387403326.

Almost surely, 2^{21200102112120} is an apocalyptic number.

21200102112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200102112120 is an abundant number, since it is smaller than the sum of its proper divisors (44119131436200).

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

21200102112120 is a wasteful number, since it uses less digits than its factorization.

21200102112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4774797824 (or 4774797820 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200102112120 its reverse (2121120100212), we get a palindrome (23321222212332).

The spelling of 21200102112120 in words is "twenty-one trillion, two hundred billion, one hundred two million, one hundred twelve thousand, one hundred twenty".