31323421 has 8 divisors (see below), whose sum is σ = 31834880. Its totient is φ = 30814992.

The previous prime is 31323403. The next prime is 31323431. The reversal of 31323421 is 12432313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31323421 - 2⁷ = 31323293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323431) 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 in 7 ways as a sum of consecutive naturals, for example, 28936 + ... + 29998.

It is an arithmetic number, because the mean of its divisors is an integer number (3979360).

Almost surely, 2^31323421 is an apocalyptic number.

It is an amenable number.

31323421 is a deficient number, since it is larger than the sum of its proper divisors (511459).

31323421 is a wasteful number, since it uses less digits than its factorization.

31323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515.

The product of its digits is 432, while the sum is 19.

The square root of 31323421 is about 5596.7330649228. The cubic root of 31323421 is about 315.2267486393.

Adding to 31323421 its reverse (12432313), we get a palindrome (43755734).

The spelling of 31323421 in words is "thirty-one million, three hundred twenty-three thousand, four hundred twenty-one".