21352626621 has 8 divisors (see below), whose sum is σ = 31633520960. Its totient is φ = 14235084396.

The previous prime is 21352626593. The next prime is 21352626623. The reversal of 21352626621 is 12662625312.

21352626621 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 2 + 6 + 26 + 621 = 666.

It is not a de Polignac number, because 21352626621 - 2³⁰ = 20278884797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352626623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395418985 + ... + 395419038.

It is an arithmetic number, because the mean of its divisors is an integer number (3954190120).

Almost surely, 2^21352626621 is an apocalyptic number.

It is an amenable number.

21352626621 is a deficient number, since it is larger than the sum of its proper divisors (10280894339).

21352626621 is an equidigital number, since it uses as much as digits as its factorization.

21352626621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790838032 (or 790838026 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The spelling of 21352626621 in words is "twenty-one billion, three hundred fifty-two million, six hundred twenty-six thousand, six hundred twenty-one".