21143193 has 4 divisors (see below), whose sum is σ = 28190928. Its totient is φ = 14095460.

The previous prime is 21143179. The next prime is 21143197. The reversal of 21143193 is 39134112.

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 21143193 - 2⁸ = 21142937 is a prime.

It is a super-2 number, since 2×21143193² = 894069220470498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21143197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3523863 + ... + 3523868.

It is an arithmetic number, because the mean of its divisors is an integer number (7047732).

Almost surely, 2^21143193 is an apocalyptic number.

It is an amenable number.

21143193 is a deficient number, since it is larger than the sum of its proper divisors (7047735).

21143193 is an equidigital number, since it uses as much as digits as its factorization.

21143193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7047734.

The product of its digits is 648, while the sum is 24.

The square root of 21143193 is about 4598.1727892718. The cubic root of 21143193 is about 276.5180749160.

The spelling of 21143193 in words is "twenty-one million, one hundred forty-three thousand, one hundred ninety-three".