21026160015 has 64 divisors (see below), whose sum is σ = 39525642240. Its totient is φ = 9343019520.

The previous prime is 21026159993. The next prime is 21026160017. The reversal of 21026160015 is 51006162012.

It is a Cunningham number, because it is equal to 145004²-1.

It is not a de Polignac number, because 21026160015 - 2⁵ = 21026159983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026160017) 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 63 ways as a sum of consecutive naturals, for example, 5363226 + ... + 5367144.

It is an arithmetic number, because the mean of its divisors is an integer number (617588160).

Almost surely, 2^21026160015 is an apocalyptic number.

21026160015 is a deficient number, since it is larger than the sum of its proper divisors (18499482225).

21026160015 is a wasteful number, since it uses less digits than its factorization.

21026160015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352.

The product of its (nonzero) digits is 720, while the sum is 24.

The spelling of 21026160015 in words is "twenty-one billion, twenty-six million, one hundred sixty thousand, fifteen".