31042021 has 2 divisors, whose sum is σ = 31042022. Its totient is φ = 31042020.

The previous prime is 31042013. The next prime is 31042027. The reversal of 31042021 is 12024013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 10692900 = 4511^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 31042021 - 2³ = 31042013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31041992 and 31042010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31042027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15521010 + 15521011.

It is an arithmetic number, because the mean of its divisors is an integer number (15521011).

Almost surely, 2^31042021 is an apocalyptic number.

It is an amenable number.

31042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31042021 is an equidigital number, since it uses as much as digits as its factorization.

31042021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31042021 is about 5571.5366821013. The cubic root of 31042021 is about 314.2799408916.

Adding to 31042021 its reverse (12024013), we get a palindrome (43066034).

The spelling of 31042021 in words is "thirty-one million, forty-two thousand, twenty-one".