211100122212221 has 4 divisors (see below), whose sum is σ = 230291042413344. Its totient is φ = 191909202011100.

The previous prime is 211100122212211. The next prime is 211100122212227. The reversal of 211100122212221 is 122212221001112.

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 211100122212221 - 2⁶ = 211100122212157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211100122212193 and 211100122212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100122212227) 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, 9595460100545 + ... + 9595460100566.

It is an arithmetic number, because the mean of its divisors is an integer number (57572760603336).

Almost surely, 2^{211100122212221} is an apocalyptic number.

It is an amenable number.

211100122212221 is a deficient number, since it is larger than the sum of its proper divisors (19190920201123).

211100122212221 is a wasteful number, since it uses less digits than its factorization.

211100122212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19190920201122.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211100122212221 its reverse (122212221001112), we get a palindrome (333312343213333).

The spelling of 211100122212221 in words is "two hundred eleven trillion, one hundred billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".