321231122102021 has 4 divisors (see below), whose sum is σ = 321325908509100. Its totient is φ = 321136335694944.

The previous prime is 321231122101999. The next prime is 321231122102029. The reversal of 321231122102021 is 120201221132123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203221703692225 + 118009418409796 = 14255585^2 + 10863214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321231122102021 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 (321231122102029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47393198456 + ... + 47393205233.

It is an arithmetic number, because the mean of its divisors is an integer number (80331477127275).

Almost surely, 2^{321231122102021} is an apocalyptic number.

It is an amenable number.

321231122102021 is a deficient number, since it is larger than the sum of its proper divisors (94786407079).

321231122102021 is an equidigital number, since it uses as much as digits as its factorization.

321231122102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94786407078.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 321231122102021 its reverse (120201221132123), we get a palindrome (441432343234144).

The spelling of 321231122102021 in words is "three hundred twenty-one trillion, two hundred thirty-one billion, one hundred twenty-two million, one hundred two thousand, twenty-one".