21143099 has 4 divisors (see below), whose sum is σ = 21155160. Its totient is φ = 21131040.

The previous prime is 21143081. The next prime is 21143113. The reversal of 21143099 is 99034112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21143099 - 2²⁰ = 20094523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143009) 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 3 ways as a sum of consecutive naturals, for example, 2837 + ... + 7094.

It is an arithmetic number, because the mean of its divisors is an integer number (5288790).

Almost surely, 2^21143099 is an apocalyptic number.

21143099 is a deficient number, since it is larger than the sum of its proper divisors (12061).

21143099 is an equidigital number, since it uses as much as digits as its factorization.

21143099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12060.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21143099 is about 4598.1625678090. The cubic root of 21143099 is about 276.5176651271.

The spelling of 21143099 in words is "twenty-one million, one hundred forty-three thousand, ninety-nine".