221317975 has 6 divisors (see below), whose sum is σ = 274434320. Its totient is φ = 177054360.

The previous prime is 221317961. The next prime is 221317981. The reversal of 221317975 is 579713122.

221317975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221317975 - 2⁷ = 221317847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4426335 + ... + 4426384.

Almost surely, 2^221317975 is an apocalyptic number.

221317975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221317975 is a deficient number, since it is larger than the sum of its proper divisors (53116345).

221317975 is an equidigital number, since it uses as much as digits as its factorization.

221317975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852729 (or 8852724 counting only the distinct ones).

The product of its digits is 26460, while the sum is 37.

The square root of 221317975 is about 14876.7595597966. The cubic root of 221317975 is about 604.8841842829.

The spelling of 221317975 in words is "two hundred twenty-one million, three hundred seventeen thousand, nine hundred seventy-five".