12997621 has 12 divisors (see below), whose sum is σ = 16086432. Its totient is φ = 10282896.

The previous prime is 12997609. The next prime is 12997631. The reversal of 12997621 is 12679921.

12997621 = 189² + 190² + ... + 357².

It is not a de Polignac number, because 12997621 - 2⁷ = 12997493 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 (12997631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4311 + ... + 6676.

It is an arithmetic number, because the mean of its divisors is an integer number (1340536).

Almost surely, 2^12997621 is an apocalyptic number.

It is an amenable number.

12997621 is a deficient number, since it is larger than the sum of its proper divisors (3088811).

12997621 is a wasteful number, since it uses less digits than its factorization.

12997621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020 (or 11007 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 12997621 is about 3605.2213524276. The cubic root of 12997621 is about 235.1191247555.

The spelling of 12997621 in words is "twelve million, nine hundred ninety-seven thousand, six hundred twenty-one".