323121320021 has 2 divisors, whose sum is σ = 323121320022. Its totient is φ = 323121320020.

The previous prime is 323121319931. The next prime is 323121320051. The reversal of 323121320021 is 120023121323.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260564307025 + 62557012996 = 510455^2 + 250114^2 .

It is a cyclic number.

It is not a de Polignac number, because 323121320021 - 2³⁰ = 322047578197 is a prime.

It is a super-2 number, since 2×323121320021² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 323121319975 and 323121320002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323121320051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161560660010 + 161560660011.

It is an arithmetic number, because the mean of its divisors is an integer number (161560660011).

Almost surely, 2^323121320021 is an apocalyptic number.

It is an amenable number.

323121320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

323121320021 is an equidigital number, since it uses as much as digits as its factorization.

323121320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 323121320021 its reverse (120023121323), we get a palindrome (443144441344).

The spelling of 323121320021 in words is "three hundred twenty-three billion, one hundred twenty-one million, three hundred twenty thousand, twenty-one".