31231313121200 has 60 divisors (see below), whose sum is σ = 75079749136128. Its totient is φ = 12484780089600.

The previous prime is 31231313121181. The next prime is 31231313121233. The reversal of 31231313121200 is 212131313213.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23557616 + ... + 24848015.

Almost surely, 2^{31231313121200} is an apocalyptic number.

It is an amenable number.

31231313121200 is an abundant number, since it is smaller than the sum of its proper divisors (43848436014928).

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

31231313121200 is a wasteful number, since it uses less digits than its factorization.

31231313121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48407262 (or 48407251 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31231313121200 its reverse (212131313213), we get a palindrome (31443444434413).

The spelling of 31231313121200 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred thirteen million, one hundred twenty-one thousand, two hundred".