212123331 has 96 divisors (see below), whose sum is σ = 391817088. Its totient is φ = 107827200.

The previous prime is 212123323. The next prime is 212123339. The reversal of 212123331 is 133321212.

212123331 is a `hidden beast` number, since 212 + 123 + 331 = 666.

It is an interprime number because it is at equal distance from previous prime (212123323) and next prime (212123339).

It is not a de Polignac number, because 212123331 - 2³ = 212123323 is a prime.

It is a super-2 number, since 2×212123331² = 89992615109071122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212123339) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2100181 + ... + 2100281.

It is an arithmetic number, because the mean of its divisors is an integer number (4081428).

Almost surely, 2^212123331 is an apocalyptic number.

212123331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212123331 is a deficient number, since it is larger than the sum of its proper divisors (179693757).

212123331 is a wasteful number, since it uses less digits than its factorization.

212123331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 218 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 212123331 is about 14564.4543667108. The cubic root of 212123331 is about 596.3888006701.

Adding to 212123331 its reverse (133321212), we get a palindrome (345444543).

It can be divided in two parts, 2121 and 23331, that added together give a palindrome (25452).

The spelling of 212123331 in words is "two hundred twelve million, one hundred twenty-three thousand, three hundred thirty-one".