31321012200 has 96 divisors (see below), whose sum is σ = 97126000800. Its totient is φ = 8349615360.

The previous prime is 31321012189. The next prime is 31321012231. The reversal of 31321012200 is 221012313.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31321012200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2525214 + ... + 2537586.

It is an arithmetic number, because the mean of its divisors is an integer number (1011729175).

Almost surely, 2^31321012200 is an apocalyptic number.

31321012200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31321012200 is an abundant number, since it is smaller than the sum of its proper divisors (65804988600).

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

31321012200 is a wasteful number, since it uses less digits than its factorization.

31321012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16611 (or 16602 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31321012200 its reverse (221012313), we get a palindrome (31542024513).

The spelling of 31321012200 in words is "thirty-one billion, three hundred twenty-one million, twelve thousand, two hundred".