31212201220120 has 32 divisors (see below), whose sum is σ = 70423072423200. Its totient is φ = 12450103656448.

The previous prime is 31212201220093. The next prime is 31212201220129. The reversal of 31212201220120 is 2102210221213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212201220129) 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 7 ways as a sum of consecutive naturals, for example, 1086761449 + ... + 1086790168.

It is an arithmetic number, because the mean of its divisors is an integer number (2200721013225).

Almost surely, 2^{31212201220120} is an apocalyptic number.

It is an amenable number.

31212201220120 is an abundant number, since it is smaller than the sum of its proper divisors (39210871203080).

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

31212201220120 is a wasteful number, since it uses less digits than its factorization.

31212201220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173551987 (or 2173551983 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 31212201220120 its reverse (2102210221213), we get a palindrome (33314411441333).

The spelling of 31212201220120 in words is "thirty-one trillion, two hundred twelve billion, two hundred one million, two hundred twenty thousand, one hundred twenty".