221431253 has 2 divisors, whose sum is σ = 221431254. Its totient is φ = 221431252.

The previous prime is 221431219. The next prime is 221431267. The reversal of 221431253 is 352134122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202578289 + 18852964 = 14233^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 221431253 - 2²⁰ = 220382677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221431213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110715626 + 110715627.

It is an arithmetic number, because the mean of its divisors is an integer number (110715627).

Almost surely, 2^221431253 is an apocalyptic number.

It is an amenable number.

221431253 is a deficient number, since it is larger than the sum of its proper divisors (1).

221431253 is an equidigital number, since it uses as much as digits as its factorization.

221431253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 221431253 is about 14880.5662862675. The cubic root of 221431253 is about 604.9873667193.

Adding to 221431253 its reverse (352134122), we get a palindrome (573565375).

The spelling of 221431253 in words is "two hundred twenty-one million, four hundred thirty-one thousand, two hundred fifty-three".