21053933459 has 16 divisors (see below), whose sum is σ = 24018869280. Its totient is φ = 18294232320.

The previous prime is 21053933447. The next prime is 21053933491. The reversal of 21053933459 is 95433935012.

It is a de Polignac number, because none of the positive numbers 2^k-21053933459 is a prime.

It is a super-2 number, since 2×21053933459² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21053933359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232682 + ... + 310239.

It is an arithmetic number, because the mean of its divisors is an integer number (1501179330).

Almost surely, 2^21053933459 is an apocalyptic number.

21053933459 is a deficient number, since it is larger than the sum of its proper divisors (2964935821).

21053933459 is a wasteful number, since it uses less digits than its factorization.

21053933459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543110.

The product of its (nonzero) digits is 437400, while the sum is 44.

The spelling of 21053933459 in words is "twenty-one billion, fifty-three million, nine hundred thirty-three thousand, four hundred fifty-nine".