31130221122 has 384 divisors, whose sum is σ = 93156231168. Its totient is φ = 7253452800.

The previous prime is 31130221121. The next prime is 31130221159. The reversal of 31130221122 is 22112203113.

It is a super-2 number, since 2×31130221122² (a number of 22 digits) contains 22 as substring.

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 = 31130221095 and 31130221104.

It is not an unprimeable number, because it can be changed into a prime (31130221121) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 129170922 + ... + 129171162.

It is an arithmetic number, because the mean of its divisors is an integer number (242594352).

Almost surely, 2^31130221122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31130221122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46578115584).

31130221122 is an abundant number, since it is smaller than the sum of its proper divisors (62026010046).

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

31130221122 is a wasteful number, since it uses less digits than its factorization.

31130221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 451 counting only the distinct ones).

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

Adding to 31130221122 its reverse (22112203113), we get a palindrome (53242424235).

It can be divided in two parts, 31130 and 221122, that added together give a palindrome (252252).

The spelling of 31130221122 in words is "thirty-one billion, one hundred thirty million, two hundred twenty-one thousand, one hundred twenty-two".