31842221 has 8 divisors (see below), whose sum is σ = 32181600. Its totient is φ = 31505040.

The previous prime is 31842193. The next prime is 31842227. The reversal of 31842221 is 12224813.

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 31842221 - 2¹⁰ = 31841197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31842227) 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, 47990 + ... + 48648.

It is an arithmetic number, because the mean of its divisors is an integer number (4022700).

Almost surely, 2^31842221 is an apocalyptic number.

It is an amenable number.

31842221 is a deficient number, since it is larger than the sum of its proper divisors (339379).

31842221 is a wasteful number, since it uses less digits than its factorization.

31842221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099.

The product of its digits is 768, while the sum is 23.

The square root of 31842221 is about 5642.8911915790. The cubic root of 31842221 is about 316.9575618138.

The spelling of 31842221 in words is "thirty-one million, eight hundred forty-two thousand, two hundred twenty-one".