3633631922721 has 16 divisors (see below), whose sum is σ = 5001231472128. Its totient is φ = 2344230067200.

The previous prime is 3633631922689. The next prime is 3633631922731. The reversal of 3633631922721 is 1272291363363.

It is not a de Polignac number, because 3633631922721 - 2⁵ = 3633631922689 is a prime.

It is a super-2 number, since 2×3633631922721² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3633631922731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4412275 + ... + 5170631.

It is an arithmetic number, because the mean of its divisors is an integer number (312576967008).

Almost surely, 2^{3633631922721} is an apocalyptic number.

3633631922721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3633631922721 is a deficient number, since it is larger than the sum of its proper divisors (1367599549407).

3633631922721 is a wasteful number, since it uses less digits than its factorization.

3633631922721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809912.

The product of its digits is 1469664, while the sum is 48.

The spelling of 3633631922721 in words is "three trillion, six hundred thirty-three billion, six hundred thirty-one million, nine hundred twenty-two thousand, seven hundred twenty-one".