12621653217 has 12 divisors (see below), whose sum is σ = 18655260624. Its totient is φ = 8218750680.

The previous prime is 12621653201. The next prime is 12621653237. The reversal of 12621653217 is 71235612621.

12621653217 is a `hidden beast` number, since 1 + 2 + 621 + 6 + 5 + 3 + 21 + 7 = 666.

It is not a de Polignac number, because 12621653217 - 2⁴ = 12621653201 is a prime.

It is a super-2 number, since 2×12621653217² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12621653237) 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, 16306659 + ... + 16307432.

It is an arithmetic number, because the mean of its divisors is an integer number (1554605052).

Almost surely, 2^12621653217 is an apocalyptic number.

It is an amenable number.

12621653217 is a deficient number, since it is larger than the sum of its proper divisors (6033607407).

12621653217 is a wasteful number, since it uses less digits than its factorization.

12621653217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32614140 (or 32614137 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 12621653217 in words is "twelve billion, six hundred twenty-one million, six hundred fifty-three thousand, two hundred seventeen".