212423231 has 4 divisors (see below), whose sum is σ = 219748200. Its totient is φ = 205098264.

The previous prime is 212423227. The next prime is 212423243. The reversal of 212423231 is 132324212.

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 212423231 - 2² = 212423227 is a prime.

It is a super-2 number, since 2×212423231² = 90247258136958722, 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 (212423251) 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, 3662441 + ... + 3662498.

It is an arithmetic number, because the mean of its divisors is an integer number (54937050).

Almost surely, 2^212423231 is an apocalyptic number.

212423231 is a deficient number, since it is larger than the sum of its proper divisors (7324969).

212423231 is an equidigital number, since it uses as much as digits as its factorization.

212423231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7324968.

The product of its digits is 576, while the sum is 20.

The square root of 212423231 is about 14574.7463442765. The cubic root of 212423231 is about 596.6697265152.

Adding to 212423231 its reverse (132324212), we get a palindrome (344747443).

The spelling of 212423231 in words is "two hundred twelve million, four hundred twenty-three thousand, two hundred thirty-one".