21021402613250 has 64 divisors (see below), whose sum is σ = 42443460259200. Its totient is φ = 7749969796800.

The previous prime is 21021402613247. The next prime is 21021402613259. The reversal of 21021402613250 is 5231620412012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21021402613259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2765780 + ... + 7049279.

It is an arithmetic number, because the mean of its divisors is an integer number (663179066550).

Almost surely, 2^{21021402613250} is an apocalyptic number.

21021402613250 is an abundant number, since it is smaller than the sum of its proper divisors (21422057645950).

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

21021402613250 is a wasteful number, since it uses less digits than its factorization.

21021402613250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9815748 (or 9815738 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21021402613250 in words is "twenty-one trillion, twenty-one billion, four hundred two million, six hundred thirteen thousand, two hundred fifty".