212311231 has 8 divisors (see below), whose sum is σ = 232609104. Its totient is φ = 192179520.

The previous prime is 212311223. The next prime is 212311247. The reversal of 212311231 is 132113212.

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 212311231 - 2³ = 212311223 is a prime.

It is a super-2 number, since 2×212311231² = 90152117617470722, 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 (212311201) 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, 38856 + ... + 43981.

It is an arithmetic number, because the mean of its divisors is an integer number (29076138).

Almost surely, 2^212311231 is an apocalyptic number.

212311231 is a deficient number, since it is larger than the sum of its proper divisors (20297873).

212311231 is a wasteful number, since it uses less digits than its factorization.

212311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83081.

The product of its digits is 72, while the sum is 16.

The square root of 212311231 is about 14570.9035752763. The cubic root of 212311231 is about 596.5648435146.

Adding to 212311231 its reverse (132113212), we get a palindrome (344424443).

The spelling of 212311231 in words is "two hundred twelve million, three hundred eleven thousand, two hundred thirty-one".