31368421 has 8 divisors (see below), whose sum is σ = 36526464. Its totient is φ = 26379600.

The previous prime is 31368419. The next prime is 31368427. The reversal of 31368421 is 12486313.

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 31368421 - 2¹ = 31368419 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 31368421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31368427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41905 + ... + 42646.

It is an arithmetic number, because the mean of its divisors is an integer number (4565808).

Almost surely, 2^31368421 is an apocalyptic number.

It is an amenable number.

31368421 is a deficient number, since it is larger than the sum of its proper divisors (5158043).

31368421 is an equidigital number, since it uses as much as digits as its factorization.

31368421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84611.

The product of its digits is 3456, while the sum is 28.

The square root of 31368421 is about 5600.7518245321. The cubic root of 31368421 is about 315.3776305856.

The spelling of 31368421 in words is "thirty-one million, three hundred sixty-eight thousand, four hundred twenty-one".