31305342120 has 128 divisors (see below), whose sum is σ = 101288154240. Its totient is φ = 7694668800.

The previous prime is 31305342091. The next prime is 31305342161. The reversal of 31305342120 is 2124350313.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1079247 + ... + 1107873.

It is an arithmetic number, because the mean of its divisors is an integer number (791313705).

Almost surely, 2^31305342120 is an apocalyptic number.

31305342120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31305342120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50644077120).

31305342120 is an abundant number, since it is smaller than the sum of its proper divisors (69982812120).

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

31305342120 is a wasteful number, since it uses less digits than its factorization.

31305342120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29355 (or 29351 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 31305342120 its reverse (2124350313), we get a palindrome (33429692433).

The spelling of 31305342120 in words is "thirty-one billion, three hundred five million, three hundred forty-two thousand, one hundred twenty".