212120311 has 4 divisors (see below), whose sum is σ = 228437272. Its totient is φ = 195803352.

The previous prime is 212120291. The next prime is 212120327. The reversal of 212120311 is 113021212.

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 212120311 - 2⁹ = 212119799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 16316947 = 212120311 / (2 + 1 + 2 + 1 + 2 + 0 + 3 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120291 and 212120300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120411) 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, 8158461 + ... + 8158486.

It is an arithmetic number, because the mean of its divisors is an integer number (57109318).

Almost surely, 2^212120311 is an apocalyptic number.

212120311 is a deficient number, since it is larger than the sum of its proper divisors (16316961).

212120311 is a wasteful number, since it uses less digits than its factorization.

212120311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16316960.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 212120311 is about 14564.3506892686. The cubic root of 212120311 is about 596.3859703941.

Adding to 212120311 its reverse (113021212), we get a palindrome (325141523).

Subtracting from 212120311 its reverse (113021212), we obtain a palindrome (99099099).

The spelling of 212120311 in words is "two hundred twelve million, one hundred twenty thousand, three hundred eleven".