21000212211211 has 2 divisors, whose sum is σ = 21000212211212. Its totient is φ = 21000212211210.

The previous prime is 21000212211197. The next prime is 21000212211217. The reversal of 21000212211211 is 11211221200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000212211211 - 2³³ = 20991622276619 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000212211217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500106105605 + 10500106105606.

It is an arithmetic number, because the mean of its divisors is an integer number (10500106105606).

Almost surely, 2^{21000212211211} is an apocalyptic number.

21000212211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000212211211 is an equidigital number, since it uses as much as digits as its factorization.

21000212211211 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 16.

Adding to 21000212211211 its reverse (11211221200012), we get a palindrome (32211433411223).

The spelling of 21000212211211 in words is "twenty-one trillion, two hundred twelve million, two hundred eleven thousand, two hundred eleven".