31221417 has 8 divisors (see below), whose sum is σ = 41845024. Its totient is φ = 20706048.

The previous prime is 31221413. The next prime is 31221431. The reversal of 31221417 is 71412213.

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

It is not a de Polignac number, because 31221417 - 2² = 31221413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31221393 and 31221402.

It is not an unprimeable number, because it can be changed into a prime (31221413) 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, 26383 + ... + 27540.

It is an arithmetic number, because the mean of its divisors is an integer number (5230628).

Almost surely, 2^31221417 is an apocalyptic number.

It is an amenable number.

31221417 is a deficient number, since it is larger than the sum of its proper divisors (10623607).

31221417 is a wasteful number, since it uses less digits than its factorization.

31221417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54119.

The product of its digits is 336, while the sum is 21.

The square root of 31221417 is about 5587.6128176530. The cubic root of 31221417 is about 314.8842003175.

The spelling of 31221417 in words is "thirty-one million, two hundred twenty-one thousand, four hundred seventeen".