21434043 has 8 divisors (see below), whose sum is σ = 28940800. Its totient is φ = 14108328.

The previous prime is 21434029. The next prime is 21434047. The reversal of 21434043 is 34043412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21434043 - 2⁴ = 21434027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44983 + ... + 45456.

It is an arithmetic number, because the mean of its divisors is an integer number (3617600).

Almost surely, 2^21434043 is an apocalyptic number.

21434043 is a deficient number, since it is larger than the sum of its proper divisors (7506757).

21434043 is an equidigital number, since it uses as much as digits as its factorization.

21434043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90521.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 21434043 is about 4629.6914584020. The cubic root of 21434043 is about 277.7802509232.

Adding to 21434043 its reverse (34043412), we get a palindrome (55477455).

The spelling of 21434043 in words is "twenty-one million, four hundred thirty-four thousand, forty-three".