21264023610615 has 16 divisors (see below), whose sum is σ = 34022518742016. Its totient is φ = 11340785604000.

The previous prime is 21264023610563. The next prime is 21264023610637. The reversal of 21264023610615 is 51601632046212.

It is not a de Polignac number, because 21264023610615 - 2⁸ = 21264023610359 is a prime.

It is a super-2 number, since 2×21264023610615² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5938470 + ... + 8820060.

It is an arithmetic number, because the mean of its divisors is an integer number (2126407421376).

Almost surely, 2^{21264023610615} is an apocalyptic number.

21264023610615 is a deficient number, since it is larger than the sum of its proper divisors (12758495131401).

21264023610615 is a wasteful number, since it uses less digits than its factorization.

21264023610615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373550.

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 21264023610615 its reverse (51601632046212), we get a palindrome (72865655656827).

The spelling of 21264023610615 in words is "twenty-one trillion, two hundred sixty-four billion, twenty-three million, six hundred ten thousand, six hundred fifteen".