21314776465 has 16 divisors (see below), whose sum is σ = 26015495616. Its totient is φ = 16760376000.

The previous prime is 21314776393. The next prime is 21314776481. The reversal of 21314776465 is 56467741312.

It is not a de Polignac number, because 21314776465 - 2²⁹ = 20777905553 is a prime.

It is a Duffinian 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, 418474 + ... + 466636.

It is an arithmetic number, because the mean of its divisors is an integer number (1625968476).

Almost surely, 2^21314776465 is an apocalyptic number.

It is an amenable number.

21314776465 is a deficient number, since it is larger than the sum of its proper divisors (4700719151).

21314776465 is a wasteful number, since it uses less digits than its factorization.

21314776465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49680.

The product of its digits is 846720, while the sum is 46.

It can be divided in two parts, 2131 and 4776465, that added together give a square (4778596 = 2186²).

The spelling of 21314776465 in words is "twenty-one billion, three hundred fourteen million, seven hundred seventy-six thousand, four hundred sixty-five".