212521231 has 8 divisors (see below), whose sum is σ = 231441840. Its totient is φ = 193968192.

The previous prime is 212521201. The next prime is 212521249. The reversal of 212521231 is 132125212.

212521231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212521231 - 2⁷ = 212521103 is a prime.

It is a super-2 number, since 2×212521231² = 90330547251510722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212521199 and 212521208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212521201) 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, 90685 + ... + 92998.

It is an arithmetic number, because the mean of its divisors is an integer number (28930230).

Almost surely, 2^212521231 is an apocalyptic number.

212521231 is a deficient number, since it is larger than the sum of its proper divisors (18920609).

212521231 is a wasteful number, since it uses less digits than its factorization.

212521231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183785.

The product of its digits is 240, while the sum is 19.

The square root of 212521231 is about 14578.1079362172. The cubic root of 212521231 is about 596.7614689031.

Adding to 212521231 its reverse (132125212), we get a palindrome (344646443).

It can be divided in two parts, 21 and 2521231, that added together give a palindrome (2521252).

The spelling of 212521231 in words is "two hundred twelve million, five hundred twenty-one thousand, two hundred thirty-one".