2101219999 has 4 divisors (see below), whose sum is σ = 2104087336. Its totient is φ = 2098352664.

The previous prime is 2101219997. The next prime is 2101220003. The reversal of 2101219999 is 9999121012.

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 2101219999 - 2¹ = 2101219997 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 (2101219997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1432569 + ... + 1434034.

It is an arithmetic number, because the mean of its divisors is an integer number (526021834).

Almost surely, 2^2101219999 is an apocalyptic number.

2101219999 is a deficient number, since it is larger than the sum of its proper divisors (2867337).

2101219999 is an equidigital number, since it uses as much as digits as its factorization.

2101219999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867336.

The product of its (nonzero) digits is 26244, while the sum is 43.

The square root of 2101219999 is about 45839.0662972099. The cubic root of 2101219999 is about 1280.8271019489.

The spelling of 2101219999 in words is "two billion, one hundred one million, two hundred nineteen thousand, nine hundred ninety-nine".