31423214021 has 2 divisors, whose sum is σ = 31423214022. Its totient is φ = 31423214020.

The previous prime is 31423213999. The next prime is 31423214023. The reversal of 31423214021 is 12041232413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23435323396 + 7987890625 = 153086^2 + 89375^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423214021 - 2⁶ = 31423213957 is a prime.

Together with 31423214023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31423214023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711607010 + 15711607011.

It is an arithmetic number, because the mean of its divisors is an integer number (15711607011).

Almost surely, 2^31423214021 is an apocalyptic number.

It is an amenable number.

31423214021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423214021 is an equidigital number, since it uses as much as digits as its factorization.

31423214021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31423214021 its reverse (12041232413), we get a palindrome (43464446434).

The spelling of 31423214021 in words is "thirty-one billion, four hundred twenty-three million, two hundred fourteen thousand, twenty-one".