31201222320212 has 72 divisors (see below), whose sum is σ = 67641802064424. Its totient is φ = 12512618969088.

The previous prime is 31201222320211. The next prime is 31201222320223. The reversal of 31201222320212 is 21202322210213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20907609930256 + 10293612389956 = 4572484^2 + 3208366^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201222320211) by changing a digit.

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, 26487473 + ... + 27640344.

It is an arithmetic number, because the mean of its divisors is an integer number (939469473117).

Almost surely, 2^{31201222320212} is an apocalyptic number.

It is an amenable number.

31201222320212 is an abundant number, since it is smaller than the sum of its proper divisors (36440579744212).

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

31201222320212 is a wasteful number, since it uses less digits than its factorization.

31201222320212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54128025 (or 54128016 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31201222320212 its reverse (21202322210213), we get a palindrome (52403544530425).

The spelling of 31201222320212 in words is "thirty-one trillion, two hundred one billion, two hundred twenty-two million, three hundred twenty thousand, two hundred twelve".