221672660 has 48 divisors (see below), whose sum is σ = 509120640. Its totient is φ = 80403840.

The previous prime is 221672641. The next prime is 221672699. The reversal of 221672660 is 66276122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106106 + ... + 108174.

It is an arithmetic number, because the mean of its divisors is an integer number (10606680).

Almost surely, 2^221672660 is an apocalyptic number.

221672660 is a gapful number since it is divisible by the number (20) 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 221672660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254560320).

221672660 is an abundant number, since it is smaller than the sum of its proper divisors (287447980).

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

221672660 is a wasteful number, since it uses less digits than its factorization.

221672660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2574 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 221672660 is about 14888.6755623192. The cubic root of 221672660 is about 605.2071416922.

The spelling of 221672660 in words is "two hundred twenty-one million, six hundred seventy-two thousand, six hundred sixty".