253662221 has 2 divisors, whose sum is σ = 253662222. Its totient is φ = 253662220.

The previous prime is 253662169. The next prime is 253662223. The reversal of 253662221 is 122266352.

253662221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236728996 + 16933225 = 15386^2 + 4115^2 .

It is a cyclic number.

It is not a de Polignac number, because 253662221 - 2¹⁴ = 253645837 is a prime.

Together with 253662223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253662223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126831110 + 126831111.

It is an arithmetic number, because the mean of its divisors is an integer number (126831111).

Almost surely, 2^253662221 is an apocalyptic number.

It is an amenable number.

253662221 is a deficient number, since it is larger than the sum of its proper divisors (1).

253662221 is an equidigital number, since it uses as much as digits as its factorization.

253662221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 253662221 is about 15926.7768553465. The cubic root of 253662221 is about 633.0216985458.

The spelling of 253662221 in words is "two hundred fifty-three million, six hundred sixty-two thousand, two hundred twenty-one".