212321231 has 4 divisors (see below), whose sum is σ = 216838752. Its totient is φ = 207803712.

The previous prime is 212321203. The next prime is 212321261. The reversal of 212321231 is 132123212.

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

It is a cyclic number.

It is not a de Polignac number, because 212321231 - 2⁶ = 212321167 is a prime.

It is a super-2 number, since 2×212321231² = 90160610266710722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212321261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258690 + ... + 2258783.

It is an arithmetic number, because the mean of its divisors is an integer number (54209688).

Almost surely, 2^212321231 is an apocalyptic number.

212321231 is a deficient number, since it is larger than the sum of its proper divisors (4517521).

212321231 is an equidigital number, since it uses as much as digits as its factorization.

212321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517520.

The product of its digits is 144, while the sum is 17.

The square root of 212321231 is about 14571.2467208541. The cubic root of 212321231 is about 596.5742095676.

Adding to 212321231 its reverse (132123212), we get a palindrome (344444443).

The spelling of 212321231 in words is "two hundred twelve million, three hundred twenty-one thousand, two hundred thirty-one".