31121103231212 has 12 divisors (see below), whose sum is σ = 55489514252256. Its totient is φ = 15266956302000.

The previous prime is 31121103231193. The next prime is 31121103231223. The reversal of 31121103231212 is 21213230112113.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73398828164 + ... + 73398828587.

It is an arithmetic number, because the mean of its divisors is an integer number (4624126187688).

Almost surely, 2^{31121103231212} is an apocalyptic number.

It is an amenable number.

31121103231212 is a deficient number, since it is larger than the sum of its proper divisors (24368411021044).

31121103231212 is a wasteful number, since it uses less digits than its factorization.

31121103231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146797656808 (or 146797656806 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31121103231212 its reverse (21213230112113), we get a palindrome (52334333343325).

The spelling of 31121103231212 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred three million, two hundred thirty-one thousand, two hundred twelve".