31121012222 has 4 divisors (see below), whose sum is σ = 46681518336. Its totient is φ = 15560506110.

The previous prime is 31121012207. The next prime is 31121012227. The reversal of 31121012222 is 22221012113.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31121012222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121012227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780253054 + ... + 7780253057.

It is an arithmetic number, because the mean of its divisors is an integer number (11670379584).

Almost surely, 2^31121012222 is an apocalyptic number.

31121012222 is a deficient number, since it is larger than the sum of its proper divisors (15560506114).

31121012222 is a wasteful number, since it uses less digits than its factorization.

31121012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15560506113.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31121012222 its reverse (22221012113), we get a palindrome (53342024335).

The spelling of 31121012222 in words is "thirty-one billion, one hundred twenty-one million, twelve thousand, two hundred twenty-two".