221975 has 12 divisors (see below), whose sum is σ = 296856. Its totient is φ = 163680.

The previous prime is 221957. The next prime is 221987. The reversal of 221975 is 579122.

It is not a de Polignac number, because 221975 - 2⁸ = 221719 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221975.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (24738).

2²²¹⁹⁷⁵ is an apocalyptic number.

221975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221975 is a deficient number, since it is larger than the sum of its proper divisors (74881).

221975 is a wasteful number, since it uses less digits than its factorization.

221975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 701 counting only the distinct ones).

The product of its digits is 1260, while the sum is 26.

The square root of 221975 is about 471.1422290562. The cubic root of 221975 is about 60.5482164635.

The spelling of 221975 in words is "two hundred twenty-one thousand, nine hundred seventy-five".