21339879465 has 32 divisors (see below), whose sum is σ = 35065086336. Its totient is φ = 11075581440.

The previous prime is 21339879437. The next prime is 21339879467. The reversal of 21339879465 is 56497893312.

It is not a de Polignac number, because 21339879465 - 2¹⁷ = 21339748393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21339879467) 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, 200454 + ... + 287856.

It is an arithmetic number, because the mean of its divisors is an integer number (1095783948).

Almost surely, 2^21339879465 is an apocalyptic number.

It is an amenable number.

21339879465 is a deficient number, since it is larger than the sum of its proper divisors (13725206871).

21339879465 is a wasteful number, since it uses less digits than its factorization.

21339879465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87849.

The product of its digits is 9797760, while the sum is 57.

The spelling of 21339879465 in words is "twenty-one billion, three hundred thirty-nine million, eight hundred seventy-nine thousand, four hundred sixty-five".