212011221101 has 4 divisors (see below), whose sum is σ = 214110342204. Its totient is φ = 209912100000.

The previous prime is 212011221089. The next prime is 212011221139. The reversal of 212011221101 is 101122110212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203468655625 + 8542565476 = 451075^2 + 92426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212011221101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011221901) 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, 1049560400 + ... + 1049560601.

It is an arithmetic number, because the mean of its divisors is an integer number (53527585551).

Almost surely, 2^212011221101 is an apocalyptic number.

It is an amenable number.

212011221101 is a deficient number, since it is larger than the sum of its proper divisors (2099121103).

212011221101 is a wasteful number, since it uses less digits than its factorization.

212011221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099121102.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212011221101 its reverse (101122110212), we get a palindrome (313133331313).

The spelling of 212011221101 in words is "two hundred twelve billion, eleven million, two hundred twenty-one thousand, one hundred one".