212021111211 has 32 divisors (see below), whose sum is σ = 357335666688. Its totient is φ = 108812730240.

The previous prime is 212021111201. The next prime is 212021111251. The reversal of 212021111211 is 112111120212.

It is a happy number.

It is not a de Polignac number, because 212021111211 - 2⁷ = 212021111083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212021111201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10484955 + ... + 10505156.

It is an arithmetic number, because the mean of its divisors is an integer number (11166739584).

Almost surely, 2^212021111211 is an apocalyptic number.

212021111211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212021111211 is a deficient number, since it is larger than the sum of its proper divisors (145314555477).

212021111211 is a wasteful number, since it uses less digits than its factorization.

212021111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20990171.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212021111211 its reverse (112111120212), we get a palindrome (324132231423).

Subtracting from 212021111211 its reverse (112111120212), we obtain a palindrome (99909990999).

The spelling of 212021111211 in words is "two hundred twelve billion, twenty-one million, one hundred eleven thousand, two hundred eleven".