21469543 has 2 divisors, whose sum is σ = 21469544. Its totient is φ = 21469542.

The previous prime is 21469517. The next prime is 21469571. The reversal of 21469543 is 34596412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21469543 - 2²¹ = 19372391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21469499 and 21469508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21469573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734771 + 10734772.

It is an arithmetic number, because the mean of its divisors is an integer number (10734772).

Almost surely, 2^21469543 is an apocalyptic number.

21469543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469543 is an equidigital number, since it uses as much as digits as its factorization.

21469543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 21469543 is about 4633.5238210243. The cubic root of 21469543 is about 277.9335236045.

The spelling of 21469543 in words is "twenty-one million, four hundred sixty-nine thousand, five hundred forty-three".