231021212 has 6 divisors (see below), whose sum is σ = 404287128. Its totient is φ = 115510604.

The previous prime is 231021191. The next prime is 231021227. The reversal of 231021212 is 212120132.

It is a happy number.

231021212 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28877648 + ... + 28877655.

It is an arithmetic number, because the mean of its divisors is an integer number (67381188).

Almost surely, 2^231021212 is an apocalyptic number.

It is an amenable number.

231021212 is a deficient number, since it is larger than the sum of its proper divisors (173265916).

231021212 is a wasteful number, since it uses less digits than its factorization.

231021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57755307 (or 57755305 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 231021212 is about 15199.3819611193. The cubic root of 231021212 is about 613.5980244057.

Adding to 231021212 its reverse (212120132), we get a palindrome (443141344).

The spelling of 231021212 in words is "two hundred thirty-one million, twenty-one thousand, two hundred twelve".