231121120212 has 72 divisors (see below), whose sum is σ = 590499412776. Its totient is φ = 76216541184.

The previous prime is 231121120201. The next prime is 231121120247. The reversal of 231121120212 is 212021121132.

231121120212 is a `hidden beast` number, since 2 + 311 + 21 + 120 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 140305681476 + 90815438736 = 374574^2 + 301356^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1365108 + ... + 1525044.

It is an arithmetic number, because the mean of its divisors is an integer number (8201380733).

Almost surely, 2^231121120212 is an apocalyptic number.

It is an amenable number.

231121120212 is an abundant number, since it is smaller than the sum of its proper divisors (359378292564).

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

231121120212 is a wasteful number, since it uses less digits than its factorization.

231121120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160377 (or 160372 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 231121120212 its reverse (212021121132), we get a palindrome (443142241344).

The spelling of 231121120212 in words is "two hundred thirty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twelve".