402450254021 has 2 divisors, whose sum is σ = 402450254022. Its totient is φ = 402450254020.

The previous prime is 402450253987. The next prime is 402450254039. The reversal of 402450254021 is 120452054204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225587951521 + 176862302500 = 474961^2 + 420550^2 .

It is a cyclic number.

It is not a de Polignac number, because 402450254021 - 2³⁰ = 401376512197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402450250021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201225127010 + 201225127011.

It is an arithmetic number, because the mean of its divisors is an integer number (201225127011).

Almost surely, 2^402450254021 is an apocalyptic number.

It is an amenable number.

402450254021 is a deficient number, since it is larger than the sum of its proper divisors (1).

402450254021 is an equidigital number, since it uses as much as digits as its factorization.

402450254021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12800, while the sum is 29.

The spelling of 402450254021 in words is "four hundred two billion, four hundred fifty million, two hundred fifty-four thousand, twenty-one".