21103013120 has 72 divisors (see below), whose sum is σ = 57769522944. Its totient is φ = 7235315712.

The previous prime is 21103013111. The next prime is 21103013143. The reversal of 21103013120 is 2131030112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21103013095 and 21103013104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1168664 + ... + 1186583.

Almost surely, 2^21103013120 is an apocalyptic number.

21103013120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103013120 is an abundant number, since it is smaller than the sum of its proper divisors (36666509824).

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

21103013120 is an equidigital number, since it uses as much as digits as its factorization.

21103013120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355275 (or 2355261 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21103013120 its reverse (2131030112), we get a palindrome (23234043232).

The spelling of 21103013120 in words is "twenty-one billion, one hundred three million, thirteen thousand, one hundred twenty".