425254021 has 2 divisors, whose sum is σ = 425254022. Its totient is φ = 425254020.

The previous prime is 425254019. The next prime is 425254079. The reversal of 425254021 is 120452524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292888996 + 132365025 = 17114^2 + 11505^2 .

It is a cyclic number.

It is not a de Polignac number, because 425254021 - 2¹ = 425254019 is a prime.

Together with 425254019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425254421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212627010 + 212627011.

It is an arithmetic number, because the mean of its divisors is an integer number (212627011).

Almost surely, 2^425254021 is an apocalyptic number.

It is an amenable number.

425254021 is a deficient number, since it is larger than the sum of its proper divisors (1).

425254021 is an equidigital number, since it uses as much as digits as its factorization.

425254021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 425254021 is about 20621.6881219749. The cubic root of 425254021 is about 751.9970604278.

The spelling of 425254021 in words is "four hundred twenty-five million, two hundred fifty-four thousand, twenty-one".