31012321212200 has 24 divisors (see below), whose sum is σ = 72103646818830. Its totient is φ = 12404928484800.

The previous prime is 31012321212181. The next prime is 31012321212203. The reversal of 31012321212200 is 221212321013.

It can be written as a sum of positive squares in 3 ways, for example, as 17260817488996 + 13751503723204 = 4154614^2 + 3708302^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31012321212203) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 77530802831 + ... + 77530803230.

Almost surely, 2^{31012321212200} is an apocalyptic number.

It is an amenable number.

31012321212200 is an abundant number, since it is smaller than the sum of its proper divisors (41091325606630).

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

31012321212200 is a wasteful number, since it uses less digits than its factorization.

31012321212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155061606077 (or 155061606068 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31012321212200 its reverse (221212321013), we get a palindrome (31233533533213).

The spelling of 31012321212200 in words is "thirty-one trillion, twelve billion, three hundred twenty-one million, two hundred twelve thousand, two hundred".