21143013 has 4 divisors (see below), whose sum is σ = 28190688. Its totient is φ = 14095340.

The previous prime is 21143009. The next prime is 21143039. The reversal of 21143013 is 31034112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21143013 - 2² = 21143009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21142983 and 21143001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143113) 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, 3523833 + ... + 3523838.

It is an arithmetic number, because the mean of its divisors is an integer number (7047672).

Almost surely, 2^21143013 is an apocalyptic number.

It is an amenable number.

21143013 is a deficient number, since it is larger than the sum of its proper divisors (7047675).

21143013 is an equidigital number, since it uses as much as digits as its factorization.

21143013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047674.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21143013 is about 4598.1532162380. The cubic root of 21143013 is about 276.5172902128.

Adding to 21143013 its reverse (31034112), we get a palindrome (52177125).

The spelling of 21143013 in words is "twenty-one million, one hundred forty-three thousand, thirteen".