402253340521 has 2 divisors, whose sum is σ = 402253340522. Its totient is φ = 402253340520.

The previous prime is 402253340513. The next prime is 402253340537. The reversal of 402253340521 is 125043352204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395766810000 + 6486530521 = 629100^2 + 80539^2 .

It is a cyclic number.

It is not a de Polignac number, because 402253340521 - 2³ = 402253340513 is a prime.

It is not a weakly prime, because it can be changed into another prime (402253340551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201126670260 + 201126670261.

It is an arithmetic number, because the mean of its divisors is an integer number (201126670261).

Almost surely, 2^402253340521 is an apocalyptic number.

It is an amenable number.

402253340521 is a deficient number, since it is larger than the sum of its proper divisors (1).

402253340521 is an equidigital number, since it uses as much as digits as its factorization.

402253340521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 402253340521 its reverse (125043352204), we get a palindrome (527296692725).

The spelling of 402253340521 in words is "four hundred two billion, two hundred fifty-three million, three hundred forty thousand, five hundred twenty-one".