21120210012120 has 64 divisors (see below), whose sum is σ = 63360966424320. Its totient is φ = 5632026102144.

The previous prime is 21120210012101. The next prime is 21120210012133. The reversal of 21120210012120 is 2121001202112.

21120210012120 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 21120210012120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31054029 + ... + 31726851.

It is an arithmetic number, because the mean of its divisors is an integer number (990015100380).

Almost surely, 2^{21120210012120} is an apocalyptic number.

21120210012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120210012120 is an abundant number, since it is smaller than the sum of its proper divisors (42240756412200).

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

21120210012120 is a wasteful number, since it uses less digits than its factorization.

21120210012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934424 (or 934420 counting only the distinct ones).

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

Adding to 21120210012120 its reverse (2121001202112), we get a palindrome (23241211214232).

The spelling of 21120210012120 in words is "twenty-one trillion, one hundred twenty billion, two hundred ten million, twelve thousand, one hundred twenty".