21012222121999 has 2 divisors, whose sum is σ = 21012222122000. Its totient is φ = 21012222121998.

The previous prime is 21012222121981. The next prime is 21012222122011. The reversal of 21012222121999 is 99912122221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012222121999 - 2¹⁷ = 21012221990927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012222121939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506111060999 + 10506111061000.

It is an arithmetic number, because the mean of its divisors is an integer number (10506111061000).

Almost surely, 2^{21012222121999} is an apocalyptic number.

21012222121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012222121999 is an equidigital number, since it uses as much as digits as its factorization.

21012222121999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 21012222121999 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-nine".