31223113120 has 96 divisors (see below), whose sum is σ = 75083500800. Its totient is φ = 12267580416.

The previous prime is 31223113081. The next prime is 31223113127. The reversal of 31223113120 is 2131132213.

It is a super-2 number, since 2×31223113120² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31223113127) 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, 2483811 + ... + 2496349.

It is an arithmetic number, because the mean of its divisors is an integer number (782119800).

Almost surely, 2^31223113120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31223113120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37541750400).

31223113120 is an abundant number, since it is smaller than the sum of its proper divisors (43860387680).

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

31223113120 is a wasteful number, since it uses less digits than its factorization.

31223113120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12830 (or 12822 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31223113120 its reverse (2131132213), we get a palindrome (33354245333).

The spelling of 31223113120 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirteen thousand, one hundred twenty".