20311232233021 has 2 divisors, whose sum is σ = 20311232233022. Its totient is φ = 20311232233020.

The previous prime is 20311232233013. The next prime is 20311232233027. The reversal of 20311232233021 is 12033223211302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12113260728921 + 8197971504100 = 3480411^2 + 2863210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311232233021 - 2³ = 20311232233013 is a prime.

It is a super-2 number, since 2×20311232233021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311232233027) 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, 10155616116510 + 10155616116511.

It is an arithmetic number, because the mean of its divisors is an integer number (10155616116511).

Almost surely, 2^{20311232233021} is an apocalyptic number.

It is an amenable number.

20311232233021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311232233021 is an equidigital number, since it uses as much as digits as its factorization.

20311232233021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20311232233021 its reverse (12033223211302), we get a palindrome (32344455444323).

The spelling of 20311232233021 in words is "twenty trillion, three hundred eleven billion, two hundred thirty-two million, two hundred thirty-three thousand, twenty-one".