31121222 has 16 divisors (see below), whose sum is σ = 51015312. Its totient is φ = 14121120.

The previous prime is 31121197. The next prime is 31121249. The reversal of 31121222 is 22212113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31121197 and 31121206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18488 + ... + 20100.

It is an arithmetic number, because the mean of its divisors is an integer number (3188457).

Almost surely, 2^31121222 is an apocalyptic number.

31121222 is a deficient number, since it is larger than the sum of its proper divisors (19894090).

31121222 is a wasteful number, since it uses less digits than its factorization.

31121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503.

The product of its digits is 48, while the sum is 14.

The square root of 31121222 is about 5578.6397983738. The cubic root of 31121222 is about 314.5469998162.

Adding to 31121222 its reverse (22212113), we get a palindrome (53333335).

It can be divided in two parts, 3112 and 1222, that added together give a palindrome (4334).

The spelling of 31121222 in words is "thirty-one million, one hundred twenty-one thousand, two hundred twenty-two".