31320213432 has 128 divisors (see below), whose sum is σ = 83816156160. Its totient is φ = 9718732800.

The previous prime is 31320213413. The next prime is 31320213467. The reversal of 31320213432 is 23431202313.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16201938 + ... + 16203870.

It is an arithmetic number, because the mean of its divisors is an integer number (654813720).

Almost surely, 2^31320213432 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 31320213432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41908078080).

31320213432 is an abundant number, since it is smaller than the sum of its proper divisors (52495942728).

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

31320213432 is a wasteful number, since it uses less digits than its factorization.

31320213432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373 (or 2369 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31320213432 its reverse (23431202313), we get a palindrome (54751415745).

The spelling of 31320213432 in words is "thirty-one billion, three hundred twenty million, two hundred thirteen thousand, four hundred thirty-two".