221905960 has 32 divisors (see below), whose sum is σ = 501078240. Its totient is φ = 88444224.

The previous prime is 221905949. The next prime is 221905969. The reversal of 221905960 is 69509122.

It is not an unprimeable number, because it can be changed into a prime (221905969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1519 + ... + 21121.

It is an arithmetic number, because the mean of its divisors is an integer number (15658695).

Almost surely, 2^221905960 is an apocalyptic number.

221905960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221905960 is an abundant number, since it is smaller than the sum of its proper divisors (279172280).

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

221905960 is a wasteful number, since it uses less digits than its factorization.

221905960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19897 (or 19893 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 221905960 is about 14896.5083157094. The cubic root of 221905960 is about 605.4193845574.

The spelling of 221905960 in words is "two hundred twenty-one million, nine hundred five thousand, nine hundred sixty".