21203110120 has 16 divisors (see below), whose sum is σ = 47706997860. Its totient is φ = 8481244032.

The previous prime is 21203110087. The next prime is 21203110139. The reversal of 21203110120 is 2101130212.

It can be written as a sum of positive squares in 2 ways, for example, as 21171996036 + 31114084 = 145506^2 + 5578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21203110120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265038837 + ... + 265038916.

Almost surely, 2^21203110120 is an apocalyptic number.

21203110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203110120 is an abundant number, since it is smaller than the sum of its proper divisors (26503887740).

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

21203110120 is a wasteful number, since it uses less digits than its factorization.

21203110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530077764 (or 530077760 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21203110120 its reverse (2101130212), we get a palindrome (23304240332).

The spelling of 21203110120 in words is "twenty-one billion, two hundred three million, one hundred ten thousand, one hundred twenty".