253867021 has 2 divisors, whose sum is σ = 253867022. Its totient is φ = 253867020.

The previous prime is 253866997. The next prime is 253867049. The reversal of 253867021 is 120768352.

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., 162282121 + 91584900 = 12739^2 + 9570^2 .

It is a cyclic number.

It is not a de Polignac number, because 253867021 - 2¹⁵ = 253834253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253867051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126933510 + 126933511.

It is an arithmetic number, because the mean of its divisors is an integer number (126933511).

Almost surely, 2^253867021 is an apocalyptic number.

It is an amenable number.

253867021 is a deficient number, since it is larger than the sum of its proper divisors (1).

253867021 is an equidigital number, since it uses as much as digits as its factorization.

253867021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 253867021 is about 15933.2049820493. The cubic root of 253867021 is about 633.1920142370.

The spelling of 253867021 in words is "two hundred fifty-three million, eight hundred sixty-seven thousand, twenty-one".