21474755536 has 20 divisors (see below), whose sum is σ = 44807903812. Its totient is φ = 9911425536.

The previous prime is 21474755531. The next prime is 21474755537. The reversal of 21474755536 is 63555747412.

It can be written as a sum of positive squares in 2 ways, for example, as 13443011136 + 8031744400 = 115944^2 + 89620^2 .

It is a super-2 number, since 2×21474755536² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21474755536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474755531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51621801 + ... + 51622216.

Almost surely, 2^21474755536 is an apocalyptic number.

21474755536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21474755536 is an abundant number, since it is smaller than the sum of its proper divisors (23333148276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21474755536 is a wasteful number, since it uses less digits than its factorization.

21474755536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103244038 (or 103244032 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 49.

The spelling of 21474755536 in words is "twenty-one billion, four hundred seventy-four million, seven hundred fifty-five thousand, five hundred thirty-six".