31113021222 has 48 divisors (see below), whose sum is σ = 67774779072. Its totient is φ = 10315272240.

The previous prime is 31113021221. The next prime is 31113021293. The reversal of 31113021222 is 22212031113.

31113021222 is a `hidden beast` number, since 311 + 130 + 2 + 1 + 222 = 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 = 31113021195 and 31113021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113021221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2707533 + ... + 2718999.

It is an arithmetic number, because the mean of its divisors is an integer number (1411974564).

Almost surely, 2^31113021222 is an apocalyptic number.

31113021222 is an abundant number, since it is smaller than the sum of its proper divisors (36661757850).

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

31113021222 is a wasteful number, since it uses less digits than its factorization.

31113021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12273 (or 12270 counting only the distinct ones).

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

Adding to 31113021222 its reverse (22212031113), we get a palindrome (53325052335).

The spelling of 31113021222 in words is "thirty-one billion, one hundred thirteen million, twenty-one thousand, two hundred twenty-two".