221165560 has 64 divisors (see below), whose sum is σ = 620421120. Its totient is φ = 68933760.

The previous prime is 221165543. The next prime is 221165573. The reversal of 221165560 is 65561122.

It is a super-2 number, since 2×221165560² = 97828409860227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 32824 + ... + 38983.

It is an arithmetic number, because the mean of its divisors is an integer number (9694080).

Almost surely, 2^221165560 is an apocalyptic number.

221165560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221165560 is an abundant number, since it is smaller than the sum of its proper divisors (399255560).

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

221165560 is a wasteful number, since it uses less digits than its factorization.

221165560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71836 (or 71832 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 221165560 is about 14871.6360902222. The cubic root of 221165560 is about 604.7452972439.

The spelling of 221165560 in words is "two hundred twenty-one million, one hundred sixty-five thousand, five hundred sixty".