212133231 has 24 divisors (see below), whose sum is σ = 323743680. Its totient is φ = 133632576.

The previous prime is 212133199. The next prime is 212133239. The reversal of 212133231 is 132331212.

It is not a de Polignac number, because 212133231 - 2⁵ = 212133199 is a prime.

It is a super-2 number, since 2×212133231² = 90001015388998722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212133239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3621 + ... + 20913.

It is an arithmetic number, because the mean of its divisors is an integer number (13489320).

Almost surely, 2^212133231 is an apocalyptic number.

212133231 is a deficient number, since it is larger than the sum of its proper divisors (111610449).

212133231 is a wasteful number, since it uses less digits than its factorization.

212133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17375 (or 17372 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 212133231 is about 14564.7942312962. The cubic root of 212133231 is about 596.3980785389.

Adding to 212133231 its reverse (132331212), we get a palindrome (344464443).

The spelling of 212133231 in words is "two hundred twelve million, one hundred thirty-three thousand, two hundred thirty-one".