31211103201212 has 12 divisors (see below), whose sum is σ = 59584833384216. Its totient is φ = 14186865091440.

The previous prime is 31211103201209. The next prime is 31211103201277. The reversal of 31211103201212 is 21210230111213.

It is a congruent 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, 354671627243 + ... + 354671627330.

It is an arithmetic number, because the mean of its divisors is an integer number (4965402782018).

Almost surely, 2^{31211103201212} is an apocalyptic number.

It is an amenable number.

31211103201212 is a deficient number, since it is larger than the sum of its proper divisors (28373730183004).

31211103201212 is a wasteful number, since it uses less digits than its factorization.

31211103201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709343254588 (or 709343254586 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31211103201212 its reverse (21210230111213), we get a palindrome (52421333312425).

The spelling of 31211103201212 in words is "thirty-one trillion, two hundred eleven billion, one hundred three million, two hundred one thousand, two hundred twelve".