31324421 has 12 divisors (see below), whose sum is σ = 33480192. Its totient is φ = 29300928.

The previous prime is 31324417. The next prime is 31324439. The reversal of 31324421 is 12442313.

It is not a de Polignac number, because 31324421 - 2² = 31324417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31324393 and 31324402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31324471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81596 + ... + 81978.

It is an arithmetic number, because the mean of its divisors is an integer number (2790016).

Almost surely, 2^31324421 is an apocalyptic number.

It is an amenable number.

31324421 is a deficient number, since it is larger than the sum of its proper divisors (2155771).

31324421 is a wasteful number, since it uses less digits than its factorization.

31324421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 683 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 31324421 is about 5596.8224020421. The cubic root of 31324421 is about 315.2301031409.

Adding to 31324421 its reverse (12442313), we get a palindrome (43766734).

The spelling of 31324421 in words is "thirty-one million, three hundred twenty-four thousand, four hundred twenty-one".