31204442112 has 72 divisors (see below), whose sum is σ = 83212576776. Its totient is φ = 10401349632.

The previous prime is 31204442111. The next prime is 31204442177. The reversal of 31204442112 is 21124440213.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31204442111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353538 + ... + 432894.

It is an arithmetic number, because the mean of its divisors is an integer number (1155730233).

Almost surely, 2^31204442112 is an apocalyptic number.

31204442112 is a gapful number since it is divisible by the number (32) 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 31204442112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41606288388).

31204442112 is an abundant number, since it is smaller than the sum of its proper divisors (52008134664).

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

31204442112 is an frugal number, since it uses more digits than its factorization.

31204442112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79394 (or 79362 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 31204442112 its reverse (21124440213), we get a palindrome (52328882325).

The spelling of 31204442112 in words is "thirty-one billion, two hundred four million, four hundred forty-two thousand, one hundred twelve".