21276440252639 has 32 divisors (see below), whose sum is σ = 25672640480256. Its totient is φ = 17371147144320.

The previous prime is 21276440252629. The next prime is 21276440252651. The reversal of 21276440252639 is 93625204467212.

It is not a de Polignac number, because 21276440252639 - 2³² = 21272145285343 is a prime.

It is a super-2 number, since 2×21276440252639² (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 (21276440252629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179660204 + ... + 179778590.

It is an arithmetic number, because the mean of its divisors is an integer number (802270015008).

Almost surely, 2^{21276440252639} is an apocalyptic number.

21276440252639 is a deficient number, since it is larger than the sum of its proper divisors (4396200227617).

21276440252639 is a wasteful number, since it uses less digits than its factorization.

21276440252639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152415.

The product of its (nonzero) digits is 8709120, while the sum is 53.

The spelling of 21276440252639 in words is "twenty-one trillion, two hundred seventy-six billion, four hundred forty million, two hundred fifty-two thousand, six hundred thirty-nine".