402331210021 has 16 divisors (see below), whose sum is σ = 433822523904. Its totient is φ = 370917725184.

The previous prime is 402331210013. The next prime is 402331210049. The reversal of 402331210021 is 120012133204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 402331210021 - 2³ = 402331210013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402331210621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52885800 + ... + 52893406.

It is an arithmetic number, because the mean of its divisors is an integer number (27113907744).

Almost surely, 2^402331210021 is an apocalyptic number.

It is an amenable number.

402331210021 is a deficient number, since it is larger than the sum of its proper divisors (31491313883).

402331210021 is a wasteful number, since it uses less digits than its factorization.

402331210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12180.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 402331210021 its reverse (120012133204), we get a palindrome (522343343225).

The spelling of 402331210021 in words is "four hundred two billion, three hundred thirty-one million, two hundred ten thousand, twenty-one".