212011121 has 4 divisors (see below), whose sum is σ = 242298432. Its totient is φ = 181723812.

The previous prime is 212011117. The next prime is 212011153. The reversal of 212011121 is 121110212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212011121 - 2² = 212011117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212011421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15143645 + ... + 15143658.

It is an arithmetic number, because the mean of its divisors is an integer number (60574608).

Almost surely, 2^212011121 is an apocalyptic number.

It is an amenable number.

212011121 is a deficient number, since it is larger than the sum of its proper divisors (30287311).

212011121 is an equidigital number, since it uses as much as digits as its factorization.

212011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30287310.

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

The square root of 212011121 is about 14560.6016702607. The cubic root of 212011121 is about 596.2836219352.

Adding to 212011121 its reverse (121110212), we get a palindrome (333121333).

Subtracting from 212011121 its reverse (121110212), we obtain a palindrome (90900909).

It can be divided in two parts, 21201 and 1121, that added together give a palindrome (22322).

The spelling of 212011121 in words is "two hundred twelve million, eleven thousand, one hundred twenty-one".