21433043 has 4 divisors (see below), whose sum is σ = 21454488. Its totient is φ = 21411600.

The previous prime is 21432991. The next prime is 21433051. The reversal of 21433043 is 34033412.

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 21433043 - 2⁶ = 21432979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21733043) 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, 9146 + ... + 11247.

It is an arithmetic number, because the mean of its divisors is an integer number (5363622).

Almost surely, 2^21433043 is an apocalyptic number.

21433043 is a deficient number, since it is larger than the sum of its proper divisors (21445).

21433043 is a wasteful number, since it uses less digits than its factorization.

21433043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21444.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 21433043 is about 4629.5834585846. The cubic root of 21433043 is about 277.7759309329.

Adding to 21433043 its reverse (34033412), we get a palindrome (55466455).

The spelling of 21433043 in words is "twenty-one million, four hundred thirty-three thousand, forty-three".