21111211100099 has 2 divisors, whose sum is σ = 21111211100100. Its totient is φ = 21111211100098.

The previous prime is 21111211100081. The next prime is 21111211100101. The reversal of 21111211100099 is 99000111211112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111211100099 is a prime.

It is a super-2 number, since 2×21111211100099² (a number of 27 digits) contains 22 as substring.

Together with 21111211100101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21111211100999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555605550049 + 10555605550050.

It is an arithmetic number, because the mean of its divisors is an integer number (10555605550050).

Almost surely, 2^{21111211100099} is an apocalyptic number.

21111211100099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111211100099 is an equidigital number, since it uses as much as digits as its factorization.

21111211100099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 29.

The spelling of 21111211100099 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred thousand, ninety-nine".