291921222672 has 120 divisors (see below), whose sum is σ = 850871103264. Its totient is φ = 96889146624.

The previous prime is 291921222667. The next prime is 291921222683. The reversal of 291921222672 is 276222129192.

291921222672 is a `hidden beast` number, since 291 + 92 + 12 + 2 + 267 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 744783 + ... + 1067025.

Almost surely, 2^291921222672 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 291921222672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425435551632).

291921222672 is an abundant number, since it is smaller than the sum of its proper divisors (558949880592).

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

291921222672 is a wasteful number, since it uses less digits than its factorization.

291921222672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322499 (or 322481 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 291921222672 in words is "two hundred ninety-one billion, nine hundred twenty-one million, two hundred twenty-two thousand, six hundred seventy-two".