221337664 has 28 divisors (see below), whose sum is σ = 448568064. Its totient is φ = 108312704.

The previous prime is 221337659. The next prime is 221337667. The reversal of 221337664 is 466733122.

It is not an unprimeable number, because it can be changed into a prime (221337667) 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, 33784 + ... + 39799.

It is an arithmetic number, because the mean of its divisors is an integer number (16020288).

Almost surely, 2^221337664 is an apocalyptic number.

It is an amenable number.

221337664 is an abundant number, since it is smaller than the sum of its proper divisors (227230400).

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

221337664 is an equidigital number, since it uses as much as digits as its factorization.

221337664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73642 (or 73632 counting only the distinct ones).

The product of its digits is 36288, while the sum is 34.

The square root of 221337664 is about 14877.4212819292. The cubic root of 221337664 is about 604.9021210871.

The spelling of 221337664 in words is "two hundred twenty-one million, three hundred thirty-seven thousand, six hundred sixty-four".