211121101999 has 4 divisors (see below), whose sum is σ = 217931460160. Its totient is φ = 204310743840.

The previous prime is 211121101987. The next prime is 211121102009. The reversal of 211121101999 is 999101121112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211121101999 - 2¹⁵ = 211121069231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121101699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405179034 + ... + 3405179095.

It is an arithmetic number, because the mean of its divisors is an integer number (54482865040).

Almost surely, 2^211121101999 is an apocalyptic number.

211121101999 is a deficient number, since it is larger than the sum of its proper divisors (6810358161).

211121101999 is an equidigital number, since it uses as much as digits as its factorization.

211121101999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810358160.

The product of its (nonzero) digits is 2916, while the sum is 37.

The spelling of 211121101999 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred one thousand, nine hundred ninety-nine".