212211231 has 4 divisors (see below), whose sum is σ = 282948312. Its totient is φ = 141474152.

The previous prime is 212211193. The next prime is 212211269. The reversal of 212211231 is 132112212.

212211231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (212211193) and next prime (212211269).

It is a cyclic number.

It is not a de Polignac number, because 212211231 - 2¹⁴ = 212194847 is a prime.

It is a super-2 number, since 2×212211231² = 90067213125070722, 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 212211231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35368536 + ... + 35368541.

It is an arithmetic number, because the mean of its divisors is an integer number (70737078).

Almost surely, 2^212211231 is an apocalyptic number.

212211231 is a deficient number, since it is larger than the sum of its proper divisors (70737081).

212211231 is an equidigital number, since it uses as much as digits as its factorization.

212211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70737080.

The product of its digits is 48, while the sum is 15.

The square root of 212211231 is about 14567.4716749338. The cubic root of 212211231 is about 596.4711668043.

Adding to 212211231 its reverse (132112212), we get a palindrome (344323443).

The spelling of 212211231 in words is "two hundred twelve million, two hundred eleven thousand, two hundred thirty-one".