21615545051512 has 16 divisors (see below), whose sum is σ = 40538703542400. Its totient is φ = 10805224106880.

The previous prime is 21615545051491. The next prime is 21615545051533. The reversal of 21615545051512 is 21515054551612.

It is an interprime number because it is at equal distance from previous prime (21615545051491) and next prime (21615545051533).

It is a super-2 number, since 2×21615545051512² (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 3 ways as a sum of consecutive naturals, for example, 318516312 + ... + 318584167.

It is an arithmetic number, because the mean of its divisors is an integer number (2533668971400).

Almost surely, 2^{21615545051512} is an apocalyptic number.

It is an amenable number.

21615545051512 is a deficient number, since it is larger than the sum of its proper divisors (18923158490888).

21615545051512 is a wasteful number, since it uses less digits than its factorization.

21615545051512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637104726 (or 637104722 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 43.

The spelling of 21615545051512 in words is "twenty-one trillion, six hundred fifteen billion, five hundred forty-five million, fifty-one thousand, five hundred twelve".