21212000100211 has 4 divisors (see below), whose sum is σ = 21212010009424. Its totient is φ = 21211990191000.

The previous prime is 21212000100163. The next prime is 21212000100227. The reversal of 21212000100211 is 11200100021212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212000100211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212000100191 and 21212000100200.

It is not an unprimeable number, because it can be changed into a prime (21212000100241) 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, 262455 + ... + 6518656.

It is an arithmetic number, because the mean of its divisors is an integer number (5303002502356).

Almost surely, 2^{21212000100211} is an apocalyptic number.

21212000100211 is a deficient number, since it is larger than the sum of its proper divisors (9909213).

21212000100211 is an equidigital number, since it uses as much as digits as its factorization.

21212000100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909212.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212000100211 its reverse (11200100021212), we get a palindrome (32412100121423).

The spelling of 21212000100211 in words is "twenty-one trillion, two hundred twelve billion, one hundred thousand, two hundred eleven".