253277021 has 2 divisors, whose sum is σ = 253277022. Its totient is φ = 253277020.

The previous prime is 253276997. The next prime is 253277041. The reversal of 253277021 is 120772352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252364996 + 912025 = 15886^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 253277021 - 2¹⁸ = 253014877 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 (253277041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126638510 + 126638511.

It is an arithmetic number, because the mean of its divisors is an integer number (126638511).

Almost surely, 2^253277021 is an apocalyptic number.

It is an amenable number.

253277021 is a deficient number, since it is larger than the sum of its proper divisors (1).

253277021 is an equidigital number, since it uses as much as digits as its factorization.

253277021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 253277021 is about 15914.6794187002. The cubic root of 253277021 is about 632.7011101538.

The spelling of 253277021 in words is "two hundred fifty-three million, two hundred seventy-seven thousand, twenty-one".