21834543 has 16 divisors (see below), whose sum is σ = 29779200. Its totient is φ = 14226240.

The previous prime is 21834529. The next prime is 21834557. The reversal of 21834543 is 34543812.

It is an interprime number because it is at equal distance from previous prime (21834529) and next prime (21834557).

It is not a de Polignac number, because 21834543 - 2⁹ = 21834031 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21834543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49518 + ... + 49956.

It is an arithmetic number, because the mean of its divisors is an integer number (1861200).

Almost surely, 2^21834543 is an apocalyptic number.

21834543 is a deficient number, since it is larger than the sum of its proper divisors (7944657).

21834543 is a wasteful number, since it uses less digits than its factorization.

21834543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782.

The product of its digits is 11520, while the sum is 30.

The square root of 21834543 is about 4672.7446966424. The cubic root of 21834543 is about 279.4997146490.

The spelling of 21834543 in words is "twenty-one million, eight hundred thirty-four thousand, five hundred forty-three".