21439706755804 has 12 divisors (see below), whose sum is σ = 37520273448504. Its totient is φ = 10719628627664.

The previous prime is 21439706755799. The next prime is 21439706755829. The reversal of 21439706755804 is 40855760793412.

It is a super-2 number, since 2×21439706755804² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55972834 + ... + 56354569.

It is an arithmetic number, because the mean of its divisors is an integer number (3126689454042).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21439706755804 = 42879413511608, but 3⋅21439706755804 = 64319120267412 is not.

Almost surely, 2^{21439706755804} is an apocalyptic number.

It is an amenable number.

21439706755804 is a deficient number, since it is larger than the sum of its proper divisors (16080566692700).

21439706755804 is a wasteful number, since it uses less digits than its factorization.

21439706755804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112375124 (or 112375122 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 61.

The spelling of 21439706755804 in words is "twenty-one trillion, four hundred thirty-nine billion, seven hundred six million, seven hundred fifty-five thousand, eight hundred four".