21515512621352 has 32 divisors (see below), whose sum is σ = 40609490764800. Its totient is φ = 10686317688000.

The previous prime is 21515512621189. The next prime is 21515512621357. The reversal of 21515512621352 is 25312621551512.

It is not an unprimeable number, because it can be changed into a prime (21515512621357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84022649 + ... + 84278327.

It is an arithmetic number, because the mean of its divisors is an integer number (1269046586400).

Almost surely, 2^{21515512621352} is an apocalyptic number.

It is an amenable number.

21515512621352 is a deficient number, since it is larger than the sum of its proper divisors (19093978143448).

21515512621352 is a wasteful number, since it uses less digits than its factorization.

21515512621352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325497 (or 325493 counting only the distinct ones).

The product of its digits is 180000, while the sum is 41.

The spelling of 21515512621352 in words is "twenty-one trillion, five hundred fifteen billion, five hundred twelve million, six hundred twenty-one thousand, three hundred fifty-two".