231220212 has 24 divisors (see below), whose sum is σ = 540150912. Its totient is φ = 76982400.

The previous prime is 231220193. The next prime is 231220217. The reversal of 231220212 is 212022132.

It is a happy number.

231220212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231220191 and 231220200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364 + ... + 21507.

It is an arithmetic number, because the mean of its divisors is an integer number (22506288).

Almost surely, 2^231220212 is an apocalyptic number.

It is an amenable number.

231220212 is an abundant number, since it is smaller than the sum of its proper divisors (308930700).

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

231220212 is a wasteful number, since it uses less digits than its factorization.

231220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22759 (or 22757 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 231220212 is about 15205.9268707961. The cubic root of 231220212 is about 613.7741568081.

Adding to 231220212 its reverse (212022132), we get a palindrome (443242344).

The spelling of 231220212 in words is "two hundred thirty-one million, two hundred twenty thousand, two hundred twelve".