212220231 has 16 divisors (see below), whose sum is σ = 309938400. Its totient is φ = 128565248.

The previous prime is 212220191. The next prime is 212220247. The reversal of 212220231 is 132022212.

It is a happy number.

212220231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 212220231 - 2¹⁰ = 212219207 is a prime.

It is a super-2 number, since 2×212220231² = 90074852891386722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212220231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220031) 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, 70266 + ... + 73223.

It is an arithmetic number, because the mean of its divisors is an integer number (19371150).

Almost surely, 2^212220231 is an apocalyptic number.

212220231 is a deficient number, since it is larger than the sum of its proper divisors (97718169).

212220231 is a wasteful number, since it uses less digits than its factorization.

212220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143538.

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

The square root of 212220231 is about 14567.7805790724. The cubic root of 212220231 is about 596.4795989132.

Adding to 212220231 its reverse (132022212), we get a palindrome (344242443).

The spelling of 212220231 in words is "two hundred twelve million, two hundred twenty thousand, two hundred thirty-one".