21675043 has 4 divisors (see below), whose sum is σ = 23342368. Its totient is φ = 20007720.

The previous prime is 21675041. The next prime is 21675047. The reversal of 21675043 is 34057612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21675043 - 2¹ = 21675041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21675041) 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, 833643 + ... + 833668.

It is an arithmetic number, because the mean of its divisors is an integer number (5835592).

Almost surely, 2^21675043 is an apocalyptic number.

21675043 is a deficient number, since it is larger than the sum of its proper divisors (1667325).

21675043 is a wasteful number, since it uses less digits than its factorization.

21675043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667324.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21675043 is about 4655.6463568446. The cubic root of 21675043 is about 278.8174745999.

The spelling of 21675043 in words is "twenty-one million, six hundred seventy-five thousand, forty-three".