21111221002211 has 2 divisors, whose sum is σ = 21111221002212. Its totient is φ = 21111221002210.

The previous prime is 21111221002153. The next prime is 21111221002213. The reversal of 21111221002211 is 11220012211112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111221002211 - 2¹⁰ = 21111221001187 is a prime.

Together with 21111221002213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111221002211.

It is not a weakly prime, because it can be changed into another prime (21111221002213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555610501105 + 10555610501106.

It is an arithmetic number, because the mean of its divisors is an integer number (10555610501106).

Almost surely, 2^{21111221002211} is an apocalyptic number.

21111221002211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111221002211 is an equidigital number, since it uses as much as digits as its factorization.

21111221002211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111221002211 its reverse (11220012211112), we get a palindrome (32331233213323).

The spelling of 21111221002211 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two thousand, two hundred eleven".