21376558144 has 14 divisors (see below), whose sum is σ = 42419107694. Its totient is φ = 10688279040.

The previous prime is 21376558139. The next prime is 21376558163. The reversal of 21376558144 is 44185567312.

It can be written as a sum of positive squares in only one way, i.e., 20883718144 + 492840000 = 144512^2 + 22200^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21376558094 and 21376558103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167004297 + ... + 167004424.

Almost surely, 2^21376558144 is an apocalyptic number.

It is an amenable number.

21376558144 is a deficient number, since it is larger than the sum of its proper divisors (21042549550).

21376558144 is an equidigital number, since it uses as much as digits as its factorization.

21376558144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334008733 (or 334008723 counting only the distinct ones).

The product of its digits is 806400, while the sum is 46.

The spelling of 21376558144 in words is "twenty-one billion, three hundred seventy-six million, five hundred fifty-eight thousand, one hundred forty-four".