31310421 has 4 divisors (see below), whose sum is σ = 41747232. Its totient is φ = 20873612.

The previous prime is 31310393. The next prime is 31310431. The reversal of 31310421 is 12401313.

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 31310421 - 2²¹ = 29213269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31310421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310431) 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, 5218401 + ... + 5218406.

It is an arithmetic number, because the mean of its divisors is an integer number (10436808).

Almost surely, 2^31310421 is an apocalyptic number.

It is an amenable number.

31310421 is a deficient number, since it is larger than the sum of its proper divisors (10436811).

31310421 is a wasteful number, since it uses less digits than its factorization.

31310421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10436810.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31310421 is about 5595.5715525762. The cubic root of 31310421 is about 315.1831336206.

Adding to 31310421 its reverse (12401313), we get a palindrome (43711734).

The spelling of 31310421 in words is "thirty-one million, three hundred ten thousand, four hundred twenty-one".