221365297 has 2 divisors, whose sum is σ = 221365298. Its totient is φ = 221365296.

The previous prime is 221365223. The next prime is 221365301. The reversal of 221365297 is 792563122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208398096 + 12967201 = 14436^2 + 3601^2 .

It is a cyclic number.

It is not a de Polignac number, because 221365297 - 2²⁷ = 87147569 is a prime.

It is not a weakly prime, because it can be changed into another prime (221365217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110682648 + 110682649.

It is an arithmetic number, because the mean of its divisors is an integer number (110682649).

Almost surely, 2^221365297 is an apocalyptic number.

It is an amenable number.

221365297 is a deficient number, since it is larger than the sum of its proper divisors (1).

221365297 is an equidigital number, since it uses as much as digits as its factorization.

221365297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 221365297 is about 14878.3499421139. The cubic root of 221365297 is about 604.9272931319.

The spelling of 221365297 in words is "two hundred twenty-one million, three hundred sixty-five thousand, two hundred ninety-seven".