21893143 has 2 divisors, whose sum is σ = 21893144. Its totient is φ = 21893142.

The previous prime is 21893141. The next prime is 21893147. The reversal of 21893143 is 34139812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21893143 - 2¹ = 21893141 is a prime.

Together with 21893141, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21893141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946571 + 10946572.

It is an arithmetic number, because the mean of its divisors is an integer number (10946572).

Almost surely, 2^21893143 is an apocalyptic number.

21893143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893143 is an equidigital number, since it uses as much as digits as its factorization.

21893143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 21893143 is about 4679.0108997522. The cubic root of 21893143 is about 279.7495336721.

The spelling of 21893143 in words is "twenty-one million, eight hundred ninety-three thousand, one hundred forty-three".