21943751199 has 4 divisors (see below), whose sum is σ = 29258334936. Its totient is φ = 14629167464.

The previous prime is 21943751191. The next prime is 21943751227. The reversal of 21943751199 is 99115734912.

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 21943751199 - 2³ = 21943751191 is a prime.

It is a super-2 number, since 2×21943751199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943751191) 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, 3657291864 + ... + 3657291869.

It is an arithmetic number, because the mean of its divisors is an integer number (7314583734).

Almost surely, 2^21943751199 is an apocalyptic number.

21943751199 is a deficient number, since it is larger than the sum of its proper divisors (7314583737).

21943751199 is an equidigital number, since it uses as much as digits as its factorization.

21943751199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314583736.

The product of its digits is 612360, while the sum is 51.

The spelling of 21943751199 in words is "twenty-one billion, nine hundred forty-three million, seven hundred fifty-one thousand, one hundred ninety-nine".