321401531023 has 2 divisors, whose sum is σ = 321401531024. Its totient is φ = 321401531022.

The previous prime is 321401530999. The next prime is 321401531057. The reversal of 321401531023 is 320135104123.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321401531023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321401531063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160700765511 + 160700765512.

It is an arithmetic number, because the mean of its divisors is an integer number (160700765512).

Almost surely, 2^321401531023 is an apocalyptic number.

321401531023 is a deficient number, since it is larger than the sum of its proper divisors (1).

321401531023 is an equidigital number, since it uses as much as digits as its factorization.

321401531023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 321401531023 its reverse (320135104123), we get a palindrome (641536635146).

The spelling of 321401531023 in words is "three hundred twenty-one billion, four hundred one million, five hundred thirty-one thousand, twenty-three".