31214321 has 4 divisors (see below), whose sum is σ = 32857200. Its totient is φ = 29571444.

The previous prime is 31214317. The next prime is 31214327. The reversal of 31214321 is 12341213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31214321 - 2² = 31214317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31214321.

It is not an unprimeable number, because it can be changed into a prime (31214327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821411 + ... + 821448.

It is an arithmetic number, because the mean of its divisors is an integer number (8214300).

Almost surely, 2^31214321 is an apocalyptic number.

It is an amenable number.

31214321 is a deficient number, since it is larger than the sum of its proper divisors (1642879).

31214321 is a wasteful number, since it uses less digits than its factorization.

31214321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642878.

The product of its digits is 144, while the sum is 17.

The square root of 31214321 is about 5586.9778055761. The cubic root of 31214321 is about 314.8603428952.

Adding to 31214321 its reverse (12341213), we get a palindrome (43555534).

The spelling of 31214321 in words is "thirty-one million, two hundred fourteen thousand, three hundred twenty-one".