21011110199 has 4 divisors (see below), whose sum is σ = 21011508480. Its totient is φ = 21010711920.

The previous prime is 21011110181. The next prime is 21011110201. The reversal of 21011110199 is 99101111012.

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 21011110199 - 2³² = 16716142903 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 (21011110999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105254 + ... + 230435.

It is an arithmetic number, because the mean of its divisors is an integer number (5252877120).

Almost surely, 2^21011110199 is an apocalyptic number.

21011110199 is a deficient number, since it is larger than the sum of its proper divisors (398281).

21011110199 is an equidigital number, since it uses as much as digits as its factorization.

21011110199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398280.

The product of its (nonzero) digits is 162, while the sum is 26.

The spelling of 21011110199 in words is "twenty-one billion, eleven million, one hundred ten thousand, one hundred ninety-nine".