221979884 has 48 divisors (see below), whose sum is σ = 451967040. Its totient is φ = 93434880.

The previous prime is 221979881. The next prime is 221979887. The reversal of 221979884 is 488979122.

It is an interprime number because it is at equal distance from previous prime (221979881) and next prime (221979887).

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 700094 + ... + 700410.

It is an arithmetic number, because the mean of its divisors is an integer number (9415980).

Almost surely, 2^221979884 is an apocalyptic number.

It is an amenable number.

221979884 is an abundant number, since it is smaller than the sum of its proper divisors (229987156).

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

221979884 is a wasteful number, since it uses less digits than its factorization.

221979884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 696 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 221979884 is about 14898.9893616983. The cubic root of 221979884 is about 605.4866053052.

It can be divided in two parts, 2219 and 79884, that multiplied together give a square (177262596 = 13314²).

The spelling of 221979884 in words is "two hundred twenty-one million, nine hundred seventy-nine thousand, eight hundred eighty-four".