31214021 has 2 divisors, whose sum is σ = 31214022. Its totient is φ = 31214020.

The previous prime is 31213999. The next prime is 31214033. The reversal of 31214021 is 12041213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 11730625 = 4414^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 31214021 - 2⁶ = 31213957 is a prime.

It is a super-3 number, since 3×31214021³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31213987 and 31214005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31214041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15607010 + 15607011.

It is an arithmetic number, because the mean of its divisors is an integer number (15607011).

Almost surely, 2^31214021 is an apocalyptic number.

It is an amenable number.

31214021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31214021 is an equidigital number, since it uses as much as digits as its factorization.

31214021 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 14.

The square root of 31214021 is about 5586.9509573648. The cubic root of 31214021 is about 314.8593341873.

Adding to 31214021 its reverse (12041213), we get a palindrome (43255234).

The spelling of 31214021 in words is "thirty-one million, two hundred fourteen thousand, twenty-one".