31230100120 has 256 divisors, whose sum is σ = 80175744000. Its totient is φ = 10888390656.

The previous prime is 31230100067. The next prime is 31230100127. The reversal of 31230100120 is 2100103213.

It is a self number, because there is not a number n which added to its sum of digits gives 31230100120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230100127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70496619 + ... + 70497061.

It is an arithmetic number, because the mean of its divisors is an integer number (313186500).

Almost surely, 2^31230100120 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 31230100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40087872000).

31230100120 is an abundant number, since it is smaller than the sum of its proper divisors (48945643880).

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

31230100120 is a wasteful number, since it uses less digits than its factorization.

31230100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31230100120 its reverse (2100103213), we get a palindrome (33330203333).

The spelling of 31230100120 in words is "thirty-one billion, two hundred thirty million, one hundred thousand, one hundred twenty".