21210111101211 has 8 divisors (see below), whose sum is σ = 28280759637264. Its totient is φ = 14139768316320.

The previous prime is 21210111101203. The next prime is 21210111101227. The reversal of 21210111101211 is 11210111101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21210111101211 - 2³ = 21210111101203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210111101611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76275876 + ... + 76553441.

It is an arithmetic number, because the mean of its divisors is an integer number (3535094954658).

Almost surely, 2^{21210111101211} is an apocalyptic number.

21210111101211 is a deficient number, since it is larger than the sum of its proper divisors (7070648536053).

21210111101211 is a wasteful number, since it uses less digits than its factorization.

21210111101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152875581.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21210111101211 its reverse (11210111101212), we get a palindrome (32420222202423).

Subtracting from 21210111101211 its reverse (11210111101212), we obtain a palindrome (9999999999999).

The spelling of 21210111101211 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, two hundred eleven".