402441023021 has 2 divisors, whose sum is σ = 402441023022. Its totient is φ = 402441023020.

The previous prime is 402441022969. The next prime is 402441023027. The reversal of 402441023021 is 120320144204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347115397225 + 55325625796 = 589165^2 + 235214^2 .

It is a cyclic number.

It is not a de Polignac number, because 402441023021 - 2¹⁴ = 402441006637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402441023027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201220511510 + 201220511511.

It is an arithmetic number, because the mean of its divisors is an integer number (201220511511).

Almost surely, 2^402441023021 is an apocalyptic number.

It is an amenable number.

402441023021 is a deficient number, since it is larger than the sum of its proper divisors (1).

402441023021 is an equidigital number, since it uses as much as digits as its factorization.

402441023021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 402441023021 its reverse (120320144204), we get a palindrome (522761167225).

The spelling of 402441023021 in words is "four hundred two billion, four hundred forty-one million, twenty-three thousand, twenty-one".