231201111101212 has 24 divisors (see below), whose sum is σ = 462576254049504. Its totient is φ = 99048897933312.

The previous prime is 231201111101189. The next prime is 231201111101237. The reversal of 231201111101212 is 212101111102132.

It is a self number, because there is not a number n which added to its sum of digits gives 231201111101212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1553780053 + ... + 1553928844.

It is an arithmetic number, because the mean of its divisors is an integer number (19274010585396).

Almost surely, 2^{231201111101212} is an apocalyptic number.

It is an amenable number.

231201111101212 is an abundant number, since it is smaller than the sum of its proper divisors (231375142948292).

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

231201111101212 is a wasteful number, since it uses less digits than its factorization.

231201111101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107711565 (or 3107711563 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 231201111101212 its reverse (212101111102132), we get a palindrome (443302222203344).

The spelling of 231201111101212 in words is "two hundred thirty-one trillion, two hundred one billion, one hundred eleven million, one hundred one thousand, two hundred twelve".