21120202110120 has 64 divisors (see below), whose sum is σ = 63362540718720. Its totient is φ = 5631881950464.

The previous prime is 21120202110023. The next prime is 21120202110127. The reversal of 21120202110120 is 2101120202112.

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 21120202110120.

It is not an unprimeable number, because it can be changed into a prime (21120202110127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1284669 + ... + 6625011.

It is an arithmetic number, because the mean of its divisors is an integer number (990039698730).

Almost surely, 2^{21120202110120} is an apocalyptic number.

21120202110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120202110120 is an abundant number, since it is smaller than the sum of its proper divisors (42242338608600).

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

21120202110120 is a wasteful number, since it uses less digits than its factorization.

21120202110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373314 (or 5373310 counting only the distinct ones).

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

Adding to 21120202110120 its reverse (2101120202112), we get a palindrome (23221322312232).

The spelling of 21120202110120 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, one hundred ten thousand, one hundred twenty".