12217138672 has 160 divisors (see below), whose sum is σ = 26707665600. Its totient is φ = 5388042240.

The previous prime is 12217138627. The next prime is 12217138697. The reversal of 12217138672 is 27683171221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35005954 + ... + 35006302.

It is an arithmetic number, because the mean of its divisors is an integer number (166922910).

Almost surely, 2^12217138672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12217138672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13353832800).

12217138672 is an abundant number, since it is smaller than the sum of its proper divisors (14490526928).

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

12217138672 is a wasteful number, since it uses less digits than its factorization.

12217138672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 525 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The spelling of 12217138672 in words is "twelve billion, two hundred seventeen million, one hundred thirty-eight thousand, six hundred seventy-two".