31121002222 has 16 divisors (see below), whose sum is σ = 47533812480. Its totient is φ = 15278698872.

The previous prime is 31121002181. The next prime is 31121002229. The reversal of 31121002222 is 22220012113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31121002196 and 31121002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121002229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548022 + ... + 602137.

It is an arithmetic number, because the mean of its divisors is an integer number (2970863280).

Almost surely, 2^31121002222 is an apocalyptic number.

31121002222 is a deficient number, since it is larger than the sum of its proper divisors (16412810258).

31121002222 is a wasteful number, since it uses less digits than its factorization.

31121002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150407.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31121002222 its reverse (22220012113), we get a palindrome (53341014335).

The spelling of 31121002222 in words is "thirty-one billion, one hundred twenty-one million, two thousand, two hundred twenty-two".