21211111111199 has 2 divisors, whose sum is σ = 21211111111200. Its totient is φ = 21211111111198.

The previous prime is 21211111111187. The next prime is 21211111111217. The reversal of 21211111111199 is 99111111111212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211111111199 is a prime.

It is a super-2 number, since 2×21211111111199² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211111111499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605555555599 + 10605555555600.

It is an arithmetic number, because the mean of its divisors is an integer number (10605555555600).

Almost surely, 2^{21211111111199} is an apocalyptic number.

21211111111199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211111111199 is an equidigital number, since it uses as much as digits as its factorization.

21211111111199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 32.

The spelling of 21211111111199 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred ninety-nine".