31440221424 has 120 divisors (see below), whose sum is σ = 93440514960. Its totient is φ = 9840531456.

The previous prime is 31440221411. The next prime is 31440221441. The reversal of 31440221424 is 42412204413.

31440221424 is a `hidden beast` number, since 3 + 1 + 440 + 2 + 214 + 2 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258322 + ... + 360014.

It is an arithmetic number, because the mean of its divisors is an integer number (778670958).

Almost surely, 2^31440221424 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 31440221424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46720257480).

31440221424 is an abundant number, since it is smaller than the sum of its proper divisors (62000293536).

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

31440221424 is a wasteful number, since it uses less digits than its factorization.

31440221424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101839 (or 101830 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 31440221424 its reverse (42412204413), we get a palindrome (73852425837).

The spelling of 31440221424 in words is "thirty-one billion, four hundred forty million, two hundred twenty-one thousand, four hundred twenty-four".