31221324344 has 16 divisors (see below), whose sum is σ = 66902838000. Its totient is φ = 13380567552.

The previous prime is 31221324341. The next prime is 31221324367. The reversal of 31221324344 is 44342312213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221324341) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 278761769 + ... + 278761880.

It is an arithmetic number, because the mean of its divisors is an integer number (4181427375).

Almost surely, 2^31221324344 is an apocalyptic number.

It is an amenable number.

31221324344 is an abundant number, since it is smaller than the sum of its proper divisors (35681513656).

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

31221324344 is a wasteful number, since it uses less digits than its factorization.

31221324344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557523662 (or 557523658 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

Adding to 31221324344 its reverse (44342312213), we get a palindrome (75563636557).

The spelling of 31221324344 in words is "thirty-one billion, two hundred twenty-one million, three hundred twenty-four thousand, three hundred forty-four".