31232131420 has 96 divisors (see below), whose sum is σ = 77911561728. Its totient is φ = 10293080832.

The previous prime is 31232131409. The next prime is 31232131459. The reversal of 31232131420 is 2413123213.

It is a junction number, because it is equal to n+sod(n) for n = 31232131391 and 31232131400.

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, 393619 + ... + 466261.

It is an arithmetic number, because the mean of its divisors is an integer number (811578768).

Almost surely, 2^31232131420 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 31232131420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38955780864).

31232131420 is an abundant number, since it is smaller than the sum of its proper divisors (46679430308).

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

31232131420 is a wasteful number, since it uses less digits than its factorization.

31232131420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72779 (or 72777 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31232131420 its reverse (2413123213), we get a palindrome (33645254633).

The spelling of 31232131420 in words is "thirty-one billion, two hundred thirty-two million, one hundred thirty-one thousand, four hundred twenty".