3656107221 has 16 divisors (see below), whose sum is σ = 5338777920. Its totient is φ = 2211776640.

The previous prime is 3656107139. The next prime is 3656107241. The reversal of 3656107221 is 1227016563.

It is not a de Polignac number, because 3656107221 - 2⁷ = 3656107093 is a prime.

It is a super-2 number, since 2×3656107221² = 26734240022896685682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656107241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792160 + ... + 796761.

It is an arithmetic number, because the mean of its divisors is an integer number (333673620).

Almost surely, 2^3656107221 is an apocalyptic number.

It is an amenable number.

3656107221 is a deficient number, since it is larger than the sum of its proper divisors (1682670699).

3656107221 is a wasteful number, since it uses less digits than its factorization.

3656107221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588996.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 3656107221 is about 60465.7524636881. The cubic root of 3656107221 is about 1540.5399833774.

The spelling of 3656107221 in words is "three billion, six hundred fifty-six million, one hundred seven thousand, two hundred twenty-one".