291021886242 has 48 divisors (see below), whose sum is σ = 650974222080. Its totient is φ = 93865543200.

The previous prime is 291021886241. The next prime is 291021886283. The reversal of 291021886242 is 242688120192.

291021886242 is a `hidden beast` number, since 2 + 9 + 1 + 0 + 2 + 18 + 8 + 624 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (291021886241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4757809 + ... + 4818587.

It is an arithmetic number, because the mean of its divisors is an integer number (13561962960).

Almost surely, 2^291021886242 is an apocalyptic number.

291021886242 is an abundant number, since it is smaller than the sum of its proper divisors (359952335838).

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

291021886242 is a wasteful number, since it uses less digits than its factorization.

291021886242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69399 (or 69396 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 291021886242 in words is "two hundred ninety-one billion, twenty-one million, eight hundred eighty-six thousand, two hundred forty-two".