221979882 has 16 divisors (see below), whose sum is σ = 445731552. Its totient is φ = 73698000.

The previous prime is 221979881. The next prime is 221979887. The reversal of 221979882 is 288979122.

It is not an unprimeable number, because it can be changed into a prime (221979881) 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, 72193 + ... + 75204.

It is an arithmetic number, because the mean of its divisors is an integer number (27858222).

Almost surely, 2^221979882 is an apocalyptic number.

221979882 is an abundant number, since it is smaller than the sum of its proper divisors (223751670).

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

221979882 is a wasteful number, since it uses less digits than its factorization.

221979882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147653.

The product of its digits is 290304, while the sum is 48.

The square root of 221979882 is about 14898.9892945797. The cubic root of 221979882 is about 605.4866034868.

The spelling of 221979882 in words is "two hundred twenty-one million, nine hundred seventy-nine thousand, eight hundred eighty-two".