31043221 has 8 divisors (see below), whose sum is σ = 33905664. Its totient is φ = 28187520.

The previous prime is 31043219. The next prime is 31043227. The reversal of 31043221 is 12234013.

It is a happy number.

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 31043221 - 2¹ = 31043219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31043195 and 31043204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31043227) 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, 17445 + ... + 19141.

It is an arithmetic number, because the mean of its divisors is an integer number (4238208).

Almost surely, 2^31043221 is an apocalyptic number.

It is an amenable number.

31043221 is a deficient number, since it is larger than the sum of its proper divisors (2862443).

31043221 is a wasteful number, since it uses less digits than its factorization.

31043221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31043221 is about 5571.6443712786. The cubic root of 31043221 is about 314.2839905750.

Adding to 31043221 its reverse (12234013), we get a palindrome (43277234).

The spelling of 31043221 in words is "thirty-one million, forty-three thousand, two hundred twenty-one".