31220302122 has 32 divisors (see below), whose sum is σ = 69394570560. Its totient is φ = 10404349200.

The previous prime is 31220302073. The next prime is 31220302123. The reversal of 31220302122 is 22120302213.

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 = 31220302095 and 31220302104.

It is not an unprimeable number, because it can be changed into a prime (31220302123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175408 + ... + 305300.

It is an arithmetic number, because the mean of its divisors is an integer number (2168580330).

Almost surely, 2^31220302122 is an apocalyptic number.

31220302122 is an abundant number, since it is smaller than the sum of its proper divisors (38174268438).

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

31220302122 is a wasteful number, since it uses less digits than its factorization.

31220302122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134355 (or 134349 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31220302122 its reverse (22120302213), we get a palindrome (53340604335).

Subtracting from 31220302122 its reverse (22120302213), we obtain a palindrome (9099999909).

The spelling of 31220302122 in words is "thirty-one billion, two hundred twenty million, three hundred two thousand, one hundred twenty-two".