31440221344 has 48 divisors (see below), whose sum is σ = 72652422528. Its totient is φ = 13110204672.

The previous prime is 31440221317. The next prime is 31440221357. The reversal of 31440221344 is 44312204413.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 7 ways as a sum of consecutive naturals, for example, 1888444 + ... + 1905019.

It is an arithmetic number, because the mean of its divisors is an integer number (1513592136).

Almost surely, 2^31440221344 is an apocalyptic number.

It is an amenable number.

31440221344 is an abundant number, since it is smaller than the sum of its proper divisors (41212201184).

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

31440221344 is a wasteful number, since it uses less digits than its factorization.

31440221344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793517 (or 3793509 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31440221344 its reverse (44312204413), we get a palindrome (75752425757).

The spelling of 31440221344 in words is "thirty-one billion, four hundred forty million, two hundred twenty-one thousand, three hundred forty-four".