221330960 has 20 divisors (see below), whose sum is σ = 514594668. Its totient is φ = 88532352.

The previous prime is 221330957. The next prime is 221330971. The reversal of 221330960 is 69033122.

It can be written as a sum of positive squares in 2 ways, for example, as 99361024 + 121969936 = 9968^2 + 11044^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383239 + ... + 1383398.

Almost surely, 2^221330960 is an apocalyptic number.

221330960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221330960 is an abundant number, since it is smaller than the sum of its proper divisors (293263708).

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

221330960 is a wasteful number, since it uses less digits than its factorization.

221330960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766650 (or 2766644 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 221330960 is about 14877.1959723598. The cubic root of 221330960 is about 604.8960138199.

The spelling of 221330960 in words is "two hundred twenty-one million, three hundred thirty thousand, nine hundred sixty".