402121129 has 2 divisors, whose sum is σ = 402121130. Its totient is φ = 402121128.

The previous prime is 402121081. The next prime is 402121133. The reversal of 402121129 is 921121204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401080729 + 1040400 = 20027^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 402121129 - 2⁷ = 402121001 is a prime.

It is not a weakly prime, because it can be changed into another prime (402121189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201060564 + 201060565.

It is an arithmetic number, because the mean of its divisors is an integer number (201060565).

Almost surely, 2^402121129 is an apocalyptic number.

It is an amenable number.

402121129 is a deficient number, since it is larger than the sum of its proper divisors (1).

402121129 is an equidigital number, since it uses as much as digits as its factorization.

402121129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 402121129 is about 20052.9581109621. The cubic root of 402121129 is about 738.1063887233.

The spelling of 402121129 in words is "four hundred two million, one hundred twenty-one thousand, one hundred twenty-nine".