21367043 has 4 divisors (see below), whose sum is σ = 21431928. Its totient is φ = 21302160.

The previous prime is 21367009. The next prime is 21367061. The reversal of 21367043 is 34076312.

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 21367043 - 2¹⁶ = 21301507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21367243) 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, 31946 + ... + 32607.

It is an arithmetic number, because the mean of its divisors is an integer number (5357982).

Almost surely, 2^21367043 is an apocalyptic number.

21367043 is a deficient number, since it is larger than the sum of its proper divisors (64885).

21367043 is an equidigital number, since it uses as much as digits as its factorization.

21367043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64884.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21367043 is about 4622.4498915618. The cubic root of 21367043 is about 277.4905139738.

The spelling of 21367043 in words is "twenty-one million, three hundred sixty-seven thousand, forty-three".