21151318199 has 4 divisors (see below), whose sum is σ = 23074165320. Its totient is φ = 19228471080.

The previous prime is 21151318183. The next prime is 21151318207. The reversal of 21151318199 is 99181315112.

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 21151318199 - 2⁴ = 21151318183 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 (21151318129) 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, 961423544 + ... + 961423565.

It is an arithmetic number, because the mean of its divisors is an integer number (5768541330).

Almost surely, 2^21151318199 is an apocalyptic number.

21151318199 is a deficient number, since it is larger than the sum of its proper divisors (1922847121).

21151318199 is a wasteful number, since it uses less digits than its factorization.

21151318199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922847120.

The product of its digits is 19440, while the sum is 41.

The spelling of 21151318199 in words is "twenty-one billion, one hundred fifty-one million, three hundred eighteen thousand, one hundred ninety-nine".