221931464 has 32 divisors (see below), whose sum is σ = 441297720. Its totient is φ = 104272896.

The previous prime is 221931427. The next prime is 221931467. The reversal of 221931464 is 464139122.

It can be written as a sum of positive squares in 4 ways, for example, as 202834564 + 19096900 = 14242^2 + 4370^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221931464.

It is not an unprimeable number, because it can be changed into a prime (221931467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147902 + ... + 149394.

Almost surely, 2^221931464 is an apocalyptic number.

It is an amenable number.

221931464 is a deficient number, since it is larger than the sum of its proper divisors (219366256).

221931464 is a wasteful number, since it uses less digits than its factorization.

221931464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609 (or 2605 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 221931464 is about 14897.3643306459. The cubic root of 221931464 is about 605.4425776020.

The spelling of 221931464 in words is "two hundred twenty-one million, nine hundred thirty-one thousand, four hundred sixty-four".