253942921 has 2 divisors, whose sum is σ = 253942922. Its totient is φ = 253942920.

The previous prime is 253942919. The next prime is 253942963. The reversal of 253942921 is 129249352.

253942921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251571321 + 2371600 = 15861^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 253942921 - 2¹ = 253942919 is a prime.

Together with 253942919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (253942901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126971460 + 126971461.

It is an arithmetic number, because the mean of its divisors is an integer number (126971461).

Almost surely, 2^253942921 is an apocalyptic number.

It is an amenable number.

253942921 is a deficient number, since it is larger than the sum of its proper divisors (1).

253942921 is an equidigital number, since it uses as much as digits as its factorization.

253942921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 253942921 is about 15935.5866223996. The cubic root of 253942921 is about 633.2551108994.

The spelling of 253942921 in words is "two hundred fifty-three million, nine hundred forty-two thousand, nine hundred twenty-one".