31421320032 has 24 divisors (see below), whose sum is σ = 82480965336. Its totient is φ = 10473773312.

The previous prime is 31421320003. The next prime is 31421320033. The reversal of 31421320032 is 23002312413.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 31421319990 and 31421320008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421320033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163652613 + ... + 163652804.

It is an arithmetic number, because the mean of its divisors is an integer number (3436706889).

Almost surely, 2^31421320032 is an apocalyptic number.

31421320032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31421320032 is an abundant number, since it is smaller than the sum of its proper divisors (51059645304).

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

31421320032 is a wasteful number, since it uses less digits than its factorization.

31421320032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327305430 (or 327305422 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31421320032 its reverse (23002312413), we get a palindrome (54423632445).

The spelling of 31421320032 in words is "thirty-one billion, four hundred twenty-one million, three hundred twenty thousand, thirty-two".