31212431244 has 96 divisors (see below), whose sum is σ = 84643776000. Its totient is φ = 9927707328.

The previous prime is 31212431231. The next prime is 31212431291. The reversal of 31212431244 is 44213421213.

It is a super-2 number, since 2×31212431244² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1025802 + ... + 1055790.

It is an arithmetic number, because the mean of its divisors is an integer number (881706000).

Almost surely, 2^31212431244 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 31212431244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42321888000).

31212431244 is an abundant number, since it is smaller than the sum of its proper divisors (53431344756).

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

31212431244 is a wasteful number, since it uses less digits than its factorization.

31212431244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30444 (or 30436 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 31212431244 its reverse (44213421213), we get a palindrome (75425852457).

The spelling of 31212431244 in words is "thirty-one billion, two hundred twelve million, four hundred thirty-one thousand, two hundred forty-four".