402021131 has 2 divisors, whose sum is σ = 402021132. Its totient is φ = 402021130.

The previous prime is 402021121. The next prime is 402021181. The reversal of 402021131 is 131120204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402021131 - 2²² = 397826827 is a prime.

It is a super-2 number, since 2×402021131² = 323241979541038322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402021101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201010565 + 201010566.

It is an arithmetic number, because the mean of its divisors is an integer number (201010566).

Almost surely, 2^402021131 is an apocalyptic number.

402021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

402021131 is an equidigital number, since it uses as much as digits as its factorization.

402021131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 402021131 is about 20050.4646080833. The cubic root of 402021131 is about 738.0452004591.

Adding to 402021131 its reverse (131120204), we get a palindrome (533141335).

The spelling of 402021131 in words is "four hundred two million, twenty-one thousand, one hundred thirty-one".