12217635720 has 48 divisors (see below), whose sum is σ = 39707317260. Its totient is φ = 3258036096.

The previous prime is 12217635671. The next prime is 12217635733. The reversal of 12217635720 is 2753671221.

12217635720 is a `hidden beast` number, since 1 + 2 + 2 + 17 + 635 + 7 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12149771076 + 67864644 = 110226^2 + 8238^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16968579 + ... + 16969298.

Almost surely, 2^12217635720 is an apocalyptic number.

12217635720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12217635720 is an abundant number, since it is smaller than the sum of its proper divisors (27489681540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12217635720 is a wasteful number, since it uses less digits than its factorization.

12217635720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33937894 (or 33937887 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 12217635720 in words is "twelve billion, two hundred seventeen million, six hundred thirty-five thousand, seven hundred twenty".