3656412221 has 32 divisors (see below), whose sum is σ = 4628275200. Its totient is φ = 2805828480.

The previous prime is 3656412167. The next prime is 3656412229. The reversal of 3656412221 is 1222146563.

It is not a de Polignac number, because 3656412221 - 2⁶ = 3656412157 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 (3656412229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4519265 + ... + 4520073.

It is an arithmetic number, because the mean of its divisors is an integer number (144633600).

Almost surely, 2^3656412221 is an apocalyptic number.

It is an amenable number.

3656412221 is a deficient number, since it is larger than the sum of its proper divisors (971862979).

3656412221 is a wasteful number, since it uses less digits than its factorization.

3656412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649.

The product of its digits is 17280, while the sum is 32.

The square root of 3656412221 is about 60468.2744999392. The cubic root of 3656412221 is about 1540.5828205264.

Adding to 3656412221 its reverse (1222146563), we get a palindrome (4878558784).

It can be divided in two parts, 36564 and 12221, that multiplied together give a palindrome (446848644).

The spelling of 3656412221 in words is "three billion, six hundred fifty-six million, four hundred twelve thousand, two hundred twenty-one".