212111331 has 8 divisors (see below), whose sum is σ = 291938304. Its totient is φ = 136845960.

The previous prime is 212111323. The next prime is 212111369. The reversal of 212111331 is 133111212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212111331 - 2³ = 212111323 is a prime.

It is a super-2 number, since 2×212111331² = 89982433477183122, 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 212111331.

It is not an unprimeable number, because it can be changed into a prime (212111371) 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, 1140291 + ... + 1140476.

It is an arithmetic number, because the mean of its divisors is an integer number (36492288).

Almost surely, 2^212111331 is an apocalyptic number.

212111331 is a deficient number, since it is larger than the sum of its proper divisors (79826973).

212111331 is a wasteful number, since it uses less digits than its factorization.

212111331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280801.

The product of its digits is 36, while the sum is 15.

The square root of 212111331 is about 14564.0423990045. The cubic root of 212111331 is about 596.3775543815.

Adding to 212111331 its reverse (133111212), we get a palindrome (345222543).

The spelling of 212111331 in words is "two hundred twelve million, one hundred eleven thousand, three hundred thirty-one".