31121132200 has 48 divisors (see below), whose sum is σ = 73228438080. Its totient is φ = 12298464960.

The previous prime is 31121132179. The next prime is 31121132209. The reversal of 31121132200 is 223112113.

It is not an unprimeable number, because it can be changed into a prime (31121132209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 920784 + ... + 953983.

It is an arithmetic number, because the mean of its divisors is an integer number (1525592460).

Almost surely, 2^31121132200 is an apocalyptic number.

It is an amenable number.

31121132200 is an abundant number, since it is smaller than the sum of its proper divisors (42107305880).

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

31121132200 is a wasteful number, since it uses less digits than its factorization.

31121132200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874866 (or 1874857 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31121132200 its reverse (223112113), we get a palindrome (31344244313).

The spelling of 31121132200 in words is "thirty-one billion, one hundred twenty-one million, one hundred thirty-two thousand, two hundred".