21111011199 has 12 divisors (see below), whose sum is σ = 30497594400. Its totient is φ = 14072202144.

The previous prime is 21111011189. The next prime is 21111011231. The reversal of 21111011199 is 99111011112.

It is not a de Polignac number, because 21111011199 - 2³¹ = 18963527551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111011189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74359 + ... + 218520.

It is an arithmetic number, because the mean of its divisors is an integer number (2541466200).

Almost surely, 2^21111011199 is an apocalyptic number.

21111011199 is a deficient number, since it is larger than the sum of its proper divisors (9386583201).

21111011199 is a wasteful number, since it uses less digits than its factorization.

21111011199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300894 (or 300891 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 27.

The spelling of 21111011199 in words is "twenty-one billion, one hundred eleven million, eleven thousand, one hundred ninety-nine".