212120111 has 4 divisors (see below), whose sum is σ = 242422992. Its totient is φ = 181817232.

The previous prime is 212120107. The next prime is 212120137. The reversal of 212120111 is 111021212.

212120111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212120111 - 2² = 212120107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212120092 and 212120101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120141) 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, 15151430 + ... + 15151443.

It is an arithmetic number, because the mean of its divisors is an integer number (60605748).

Almost surely, 2^212120111 is an apocalyptic number.

212120111 is a deficient number, since it is larger than the sum of its proper divisors (30302881).

212120111 is an equidigital number, since it uses as much as digits as its factorization.

212120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30302880.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 212120111 is about 14564.3438231868. The cubic root of 212120111 is about 596.3857829576.

Adding to 212120111 its reverse (111021212), we get a palindrome (323141323).

It can be divided in two parts, 2121201 and 11, that added together give a palindrome (2121212).

The spelling of 212120111 in words is "two hundred twelve million, one hundred twenty thousand, one hundred eleven".