32131231220 has 24 divisors (see below), whose sum is σ = 73609730208. Its totient is φ = 11684084000.

The previous prime is 32131231217. The next prime is 32131231273. The reversal of 32131231220 is 2213213123.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 32131231192 and 32131231201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73025306 + ... + 73025745.

It is an arithmetic number, because the mean of its divisors is an integer number (3067072092).

Almost surely, 2^32131231220 is an apocalyptic number.

It is an amenable number.

32131231220 is an abundant number, since it is smaller than the sum of its proper divisors (41478498988).

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

32131231220 is a wasteful number, since it uses less digits than its factorization.

32131231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146051071 (or 146051069 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 32131231220 its reverse (2213213123), we get a palindrome (34344444343).

The spelling of 32131231220 in words is "thirty-two billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty".