21110122020120 has 128 divisors (see below), whose sum is σ = 72389345725440. Its totient is φ = 4824385113600.

The previous prime is 21110122020109. The next prime is 21110122020131. The reversal of 21110122020120 is 2102022101112.

It is an interprime number because it is at equal distance from previous prime (21110122020109) and next prime (21110122020131).

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 21110122020120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3123994 + ... + 7209686.

It is an arithmetic number, because the mean of its divisors is an integer number (565541763480).

Almost surely, 2^{21110122020120} is an apocalyptic number.

21110122020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110122020120 is an abundant number, since it is smaller than the sum of its proper divisors (51279223705320).

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

21110122020120 is a wasteful number, since it uses less digits than its factorization.

21110122020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091865 (or 4091861 counting only the distinct ones).

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

Adding to 21110122020120 its reverse (2102022101112), we get a palindrome (23212144121232).

The spelling of 21110122020120 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-two million, twenty thousand, one hundred twenty".