231121212 has 48 divisors (see below), whose sum is σ = 624782592. Its totient is φ = 65128320.

The previous prime is 231121207. The next prime is 231121217. The reversal of 231121212 is 212121132.

231121212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231121207) and next prime (231121217).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231121191 and 231121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231121217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12714 + ... + 24977.

It is an arithmetic number, because the mean of its divisors is an integer number (13016304).

Almost surely, 2^231121212 is an apocalyptic number.

It is an amenable number.

231121212 is an abundant number, since it is smaller than the sum of its proper divisors (393661380).

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

231121212 is a wasteful number, since it uses less digits than its factorization.

231121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37778 (or 37776 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 231121212 is about 15202.6712126521. The cubic root of 231121212 is about 613.6865457881.

Adding to 231121212 its reverse (212121132), we get a palindrome (443242344).

It can be divided in two parts, 231 and 121212, that multiplied together give a palindrome (27999972).

The spelling of 231121212 in words is "two hundred thirty-one million, one hundred twenty-one thousand, two hundred twelve".