212120011 has 4 divisors (see below), whose sum is σ = 218962624. Its totient is φ = 205277400.

The previous prime is 212120003. The next prime is 212120017. The reversal of 212120011 is 110021212.

212120011 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 212120011 - 2³ = 212120003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212120011.

It is not an unprimeable number, because it can be changed into a prime (212120017) 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, 3421260 + ... + 3421321.

It is an arithmetic number, because the mean of its divisors is an integer number (54740656).

Almost surely, 2^212120011 is an apocalyptic number.

212120011 is a deficient number, since it is larger than the sum of its proper divisors (6842613).

212120011 is an equidigital number, since it uses as much as digits as its factorization.

212120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6842612.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 212120011 is about 14564.3403901447. The cubic root of 212120011 is about 596.3856892394.

Adding to 212120011 its reverse (110021212), we get a palindrome (322141223).

The spelling of 212120011 in words is "two hundred twelve million, one hundred twenty thousand, eleven".