31423133321 has 2 divisors, whose sum is σ = 31423133322. Its totient is φ = 31423133320.

The previous prime is 31423133297. The next prime is 31423133323. The reversal of 31423133321 is 12333132413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19415356921 + 12007776400 = 139339^2 + 109580^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423133321 - 2¹⁰ = 31423132297 is a prime.

Together with 31423133323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31423133323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711566660 + 15711566661.

It is an arithmetic number, because the mean of its divisors is an integer number (15711566661).

Almost surely, 2^31423133321 is an apocalyptic number.

It is an amenable number.

31423133321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423133321 is an equidigital number, since it uses as much as digits as its factorization.

31423133321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 26.

Adding to 31423133321 its reverse (12333132413), we get a palindrome (43756265734).

The spelling of 31423133321 in words is "thirty-one billion, four hundred twenty-three million, one hundred thirty-three thousand, three hundred twenty-one".