221236297 has 2 divisors, whose sum is σ = 221236298. Its totient is φ = 221236296.

The previous prime is 221236277. The next prime is 221236349. The reversal of 221236297 is 792632122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111007296 + 110229001 = 10536^2 + 10499^2 .

It is a cyclic number.

It is not a de Polignac number, because 221236297 - 2¹¹ = 221234249 is a prime.

It is a super-2 number, since 2×221236297² = 97890998220544418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221236207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110618148 + 110618149.

It is an arithmetic number, because the mean of its divisors is an integer number (110618149).

Almost surely, 2^221236297 is an apocalyptic number.

It is an amenable number.

221236297 is a deficient number, since it is larger than the sum of its proper divisors (1).

221236297 is an equidigital number, since it uses as much as digits as its factorization.

221236297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 221236297 is about 14874.0141522052. The cubic root of 221236297 is about 604.8097637432.

The spelling of 221236297 in words is "two hundred twenty-one million, two hundred thirty-six thousand, two hundred ninety-seven".