31232021201021 has 2 divisors, whose sum is σ = 31232021201022. Its totient is φ = 31232021201020.

The previous prime is 31232021201009. The next prime is 31232021201041. The reversal of 31232021201021 is 12010212023213.

It is an a-pointer prime, because the next prime (31232021201041) can be obtained adding 31232021201021 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24949925100100 + 6282096100921 = 4994990^2 + 2506411^2 .

It is a cyclic number.

It is not a de Polignac number, because 31232021201021 - 2³⁴ = 31214841331837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31232021200984 and 31232021201002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31232021201041) 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, 15616010600510 + 15616010600511.

It is an arithmetic number, because the mean of its divisors is an integer number (15616010600511).

Almost surely, 2^{31232021201021} is an apocalyptic number.

It is an amenable number.

31232021201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31232021201021 is an equidigital number, since it uses as much as digits as its factorization.

31232021201021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31232021201021 its reverse (12010212023213), we get a palindrome (43242233224234).

The spelling of 31232021201021 in words is "thirty-one trillion, two hundred thirty-two billion, twenty-one million, two hundred one thousand, twenty-one".