221313976 has 64 divisors (see below), whose sum is σ = 480614400. Its totient is φ = 94670208.

The previous prime is 221313959. The next prime is 221313977. The reversal of 221313976 is 679313122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221313977) 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, 91681 + ... + 94063.

It is an arithmetic number, because the mean of its divisors is an integer number (7509600).

Almost surely, 2^221313976 is an apocalyptic number.

221313976 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221313976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240307200).

221313976 is an abundant number, since it is smaller than the sum of its proper divisors (259300424).

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

221313976 is a wasteful number, since it uses less digits than its factorization.

221313976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468 (or 2464 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The square root of 221313976 is about 14876.6251549200. The cubic root of 221313976 is about 604.8805410385.

The spelling of 221313976 in words is "two hundred twenty-one million, three hundred thirteen thousand, nine hundred seventy-six".