21315315353550 has 96 divisors (see below), whose sum is σ = 54623758296192. Its totient is φ = 5496530762880.

The previous prime is 21315315353459. The next prime is 21315315353597. The reversal of 21315315353550 is 5535351351312.

It is a super-2 number, since 2×21315315353550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10876324 + ... + 12685623.

It is an arithmetic number, because the mean of its divisors is an integer number (568997482252).

Almost surely, 2^{21315315353550} is an apocalyptic number.

21315315353550 is an abundant number, since it is smaller than the sum of its proper divisors (33308442942642).

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

21315315353550 is a wasteful number, since it uses less digits than its factorization.

21315315353550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23562162 (or 23562157 counting only the distinct ones).

The product of its (nonzero) digits is 506250, while the sum is 42.

The spelling of 21315315353550 in words is "twenty-one trillion, three hundred fifteen billion, three hundred fifteen million, three hundred fifty-three thousand, five hundred fifty".