21351355315 has 16 divisors (see below), whose sum is σ = 26029681920. Its totient is φ = 16809550560.

The previous prime is 21351355313. The next prime is 21351355327. The reversal of 21351355315 is 51355315312.

It is not a de Polignac number, because 21351355315 - 2¹ = 21351355313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21351355313) 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, 314476 + ... + 376294.

It is an arithmetic number, because the mean of its divisors is an integer number (1626855120).

Almost surely, 2^21351355315 is an apocalyptic number.

21351355315 is a deficient number, since it is larger than the sum of its proper divisors (4678326605).

21351355315 is a wasteful number, since it uses less digits than its factorization.

21351355315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62922.

The product of its digits is 33750, while the sum is 34.

The spelling of 21351355315 in words is "twenty-one billion, three hundred fifty-one million, three hundred fifty-five thousand, three hundred fifteen".