221439976 has 16 divisors (see below), whose sum is σ = 415370340. Its totient is φ = 110674560.

The previous prime is 221439973. The next prime is 221439979. The reversal of 221439976 is 679934122.

It is an interprime number because it is at equal distance from previous prime (221439973) and next prime (221439979).

It can be written as a sum of positive squares in 2 ways, for example, as 186322500 + 35117476 = 13650^2 + 5926^2 .

It is not an unprimeable number, because it can be changed into a prime (221439973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24420 + ... + 32236.

Almost surely, 2^221439976 is an apocalyptic number.

It is an amenable number.

221439976 is a deficient number, since it is larger than the sum of its proper divisors (193930364).

221439976 is a wasteful number, since it uses less digits than its factorization.

221439976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11364 (or 11360 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 221439976 is about 14880.8593837856. The cubic root of 221439976 is about 604.9953108486.

The spelling of 221439976 in words is "two hundred twenty-one million, four hundred thirty-nine thousand, nine hundred seventy-six".