31031121222 has 20 divisors (see below), whose sum is σ = 69532697916. Its totient is φ = 10343707020.

The previous prime is 31031121211. The next prime is 31031121257. The reversal of 31031121222 is 22212113013.

31031121222 is a `hidden beast` number, since 310 + 311 + 21 + 2 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31031121195 and 31031121204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 95774904 + ... + 95775227.

Almost surely, 2^31031121222 is an apocalyptic number.

31031121222 is an abundant number, since it is smaller than the sum of its proper divisors (38501576694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31031121222 is a wasteful number, since it uses less digits than its factorization.

31031121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191550145 (or 191550136 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31031121222 its reverse (22212113013), we get a palindrome (53243234235).

The spelling of 31031121222 in words is "thirty-one billion, thirty-one million, one hundred twenty-one thousand, two hundred twenty-two".