212040311 has 4 divisors (see below), whose sum is σ = 242331792. Its totient is φ = 181748832.

The previous prime is 212040281. The next prime is 212040313. The reversal of 212040311 is 113040212.

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 212040311 - 2¹⁸ = 211778167 is a prime.

It is a super-2 number, since 2×212040311² = 89922186977953442, 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 (212040313) 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, 15145730 + ... + 15145743.

It is an arithmetic number, because the mean of its divisors is an integer number (60582948).

Almost surely, 2^212040311 is an apocalyptic number.

212040311 is a deficient number, since it is larger than the sum of its proper divisors (30291481).

212040311 is an equidigital number, since it uses as much as digits as its factorization.

212040311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30291480.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 212040311 is about 14561.6039981865. The cubic root of 212040311 is about 596.3109864119.

Adding to 212040311 its reverse (113040212), we get a palindrome (325080523).

Subtracting from 212040311 its reverse (113040212), we obtain a palindrome (99000099).

The spelling of 212040311 in words is "two hundred twelve million, forty thousand, three hundred eleven".