11639722221 has 32 divisors (see below), whose sum is σ = 18176768000. Its totient is φ = 7341216624.

The previous prime is 11639722207. The next prime is 11639722261. The reversal of 11639722221 is 12222793611.

11639722221 is a `hidden beast` number, since 11 + 639 + 7 + 2 + 2 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 11639722221 - 2⁵ = 11639722189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11639722201) 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, 363756 + ... + 394458.

It is an arithmetic number, because the mean of its divisors is an integer number (568024000).

Almost surely, 2^11639722221 is an apocalyptic number.

It is an amenable number.

11639722221 is a deficient number, since it is larger than the sum of its proper divisors (6537045779).

11639722221 is a wasteful number, since it uses less digits than its factorization.

11639722221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31470 (or 31464 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The spelling of 11639722221 in words is "eleven billion, six hundred thirty-nine million, seven hundred twenty-two thousand, two hundred twenty-one".