21111210999199 has 2 divisors, whose sum is σ = 21111210999200. Its totient is φ = 21111210999198.

The previous prime is 21111210999169. The next prime is 21111210999209. The reversal of 21111210999199 is 99199901211112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111210999199 - 2⁷ = 21111210999071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111210999169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555605499599 + 10555605499600.

It is an arithmetic number, because the mean of its divisors is an integer number (10555605499600).

Almost surely, 2^{21111210999199} is an apocalyptic number.

21111210999199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111210999199 is an equidigital number, since it uses as much as digits as its factorization.

21111210999199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 55.

The spelling of 21111210999199 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, nine hundred ninety-nine thousand, one hundred ninety-nine".