21199143 has 8 divisors (see below), whose sum is σ = 32303488. Its totient is φ = 12113784.

The previous prime is 21199141. The next prime is 21199183. The reversal of 21199143 is 34199112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21199143 - 2¹ = 21199141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21199143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504721 + ... + 504762.

It is an arithmetic number, because the mean of its divisors is an integer number (4037936).

Almost surely, 2^21199143 is an apocalyptic number.

21199143 is a deficient number, since it is larger than the sum of its proper divisors (11104345).

21199143 is a wasteful number, since it uses less digits than its factorization.

21199143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009493.

The product of its digits is 1944, while the sum is 30.

The square root of 21199143 is about 4604.2527080950. The cubic root of 21199143 is about 276.7617713070.

The spelling of 21199143 in words is "twenty-one million, one hundred ninety-nine thousand, one hundred forty-three".