21343143 has 8 divisors (see below), whose sum is σ = 30131568. Its totient is φ = 13391744.

The previous prime is 21343141. The next prime is 21343151. The reversal of 21343143 is 34134312.

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

It is a cyclic number.

It is not a de Polignac number, because 21343143 - 2¹ = 21343141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209196 + ... + 209297.

It is an arithmetic number, because the mean of its divisors is an integer number (3766446).

Almost surely, 2^21343143 is an apocalyptic number.

21343143 is a deficient number, since it is larger than the sum of its proper divisors (8788425).

21343143 is a wasteful number, since it uses less digits than its factorization.

21343143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418513.

The product of its digits is 864, while the sum is 21.

The square root of 21343143 is about 4619.8639590360. The cubic root of 21343143 is about 277.3870134947.

Adding to 21343143 its reverse (34134312), we get a palindrome (55477455).

The spelling of 21343143 in words is "twenty-one million, three hundred forty-three thousand, one hundred forty-three".