21310403124 has 12 divisors (see below), whose sum is σ = 49724273984. Its totient is φ = 7103467704.

The previous prime is 21310403119. The next prime is 21310403143. The reversal of 21310403124 is 42130401312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21310403124.

It is a congruent number.

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, 887933452 + ... + 887933475.

Almost surely, 2^21310403124 is an apocalyptic number.

It is an amenable number.

21310403124 is an abundant number, since it is smaller than the sum of its proper divisors (28413870860).

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

21310403124 is a wasteful number, since it uses less digits than its factorization.

21310403124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775866934 (or 1775866932 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21310403124 its reverse (42130401312), we get a palindrome (63440804436).

The spelling of 21310403124 in words is "twenty-one billion, three hundred ten million, four hundred three thousand, one hundred twenty-four".