31342221 has 20 divisors (see below), whose sum is σ = 47044800. Its totient is φ = 20794536.

The previous prime is 31342217. The next prime is 31342231. The reversal of 31342221 is 12224313.

It is not a de Polignac number, because 31342221 - 2² = 31342217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31342194 and 31342203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31342231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18550 + ... + 20168.

It is an arithmetic number, because the mean of its divisors is an integer number (2352240).

Almost surely, 2^31342221 is an apocalyptic number.

It is an amenable number.

31342221 is a deficient number, since it is larger than the sum of its proper divisors (15702579).

31342221 is a wasteful number, since it uses less digits than its factorization.

31342221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1861 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 31342221 is about 5598.4123642333. The cubic root of 31342221 is about 315.2898013270.

Adding to 31342221 its reverse (12224313), we get a palindrome (43566534).

The spelling of 31342221 in words is "thirty-one million, three hundred forty-two thousand, two hundred twenty-one".