21554576423613 has 16 divisors (see below), whose sum is σ = 32326936752000. Its totient is φ = 14369717614284.

The previous prime is 21554576423591. The next prime is 21554576423629. The reversal of 21554576423613 is 31632467545512.

21554576423613 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 4 + 576 + 4 + 2 + 3 + 61 + 3 = 666.

It is not a de Polignac number, because 21554576423613 - 2³³ = 21545986489021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21554576423613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554576423693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4927884513 + ... + 4927888886.

It is an arithmetic number, because the mean of its divisors is an integer number (2020433547000).

Almost surely, 2^{21554576423613} is an apocalyptic number.

It is an amenable number.

21554576423613 is a deficient number, since it is larger than the sum of its proper divisors (10772360328387).

21554576423613 is an frugal number, since it uses more digits than its factorization.

21554576423613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9855773420 (or 9855773402 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 54.

The spelling of 21554576423613 in words is "twenty-one trillion, five hundred fifty-four billion, five hundred seventy-six million, four hundred twenty-three thousand, six hundred thirteen".