21515455525413 has 16 divisors (see below), whose sum is σ = 29705613652800. Its totient is φ = 13835437983360.

The previous prime is 21515455525393. The next prime is 21515455525429. The reversal of 21515455525413 is 31452555451512.

It is not a de Polignac number, because 21515455525413 - 2⁵ = 21515455525381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515455525483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121257808 + ... + 121435113.

It is an arithmetic number, because the mean of its divisors is an integer number (1856600853300).

Almost surely, 2^{21515455525413} is an apocalyptic number.

It is an amenable number.

21515455525413 is a deficient number, since it is larger than the sum of its proper divisors (8190158127387).

21515455525413 is a wasteful number, since it uses less digits than its factorization.

21515455525413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242693972.

The product of its digits is 3000000, while the sum is 48.

The spelling of 21515455525413 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-five million, five hundred twenty-five thousand, four hundred thirteen".