21515002054413 has 128 divisors (see below), whose sum is σ = 34764202598400. Its totient is φ = 11570762649600.

The previous prime is 21515002054369. The next prime is 21515002054423. The reversal of 21515002054413 is 31445020051512.

It is not a de Polignac number, because 21515002054413 - 2⁸ = 21515002054157 is a prime.

It is a super-2 number, since 2×21515002054413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515002054423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8814010273 + ... + 8814012713.

It is an arithmetic number, because the mean of its divisors is an integer number (271595332800).

Almost surely, 2^{21515002054413} is an apocalyptic number.

21515002054413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21515002054413 is a deficient number, since it is larger than the sum of its proper divisors (13249200543987).

21515002054413 is a wasteful number, since it uses less digits than its factorization.

21515002054413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 21515002054413 in words is "twenty-one trillion, five hundred fifteen billion, two million, fifty-four thousand, four hundred thirteen".