21515410552005 has 48 divisors (see below), whose sum is σ = 37326442083840. Its totient is φ = 11464714819584.

The previous prime is 21515410552003. The next prime is 21515410552043. The reversal of 21515410552005 is 50025501451512.

21515410552005 is a `hidden beast` number, since 2 + 1 + 51 + 54 + 1 + 0 + 552 + 0 + 0 + 5 = 666.

It is not a de Polignac number, because 21515410552005 - 2¹ = 21515410552003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515410552003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 460662484 + ... + 460709186.

It is an arithmetic number, because the mean of its divisors is an integer number (777634210080).

Almost surely, 2^{21515410552005} is an apocalyptic number.

It is an amenable number.

21515410552005 is a deficient number, since it is larger than the sum of its proper divisors (15811031531835).

21515410552005 is a wasteful number, since it uses less digits than its factorization.

21515410552005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55570 (or 55567 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The spelling of 21515410552005 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-two thousand, five".