21430843 has 8 divisors (see below), whose sum is σ = 24602112. Its totient is φ = 18287016.

The previous prime is 21430831. The next prime is 21430847. The reversal of 21430843 is 34803412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21430843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21430847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5155 + ... + 8332.

It is an arithmetic number, because the mean of its divisors is an integer number (3075264).

Almost surely, 2^21430843 is an apocalyptic number.

21430843 is a deficient number, since it is larger than the sum of its proper divisors (3171269).

21430843 is a wasteful number, since it uses less digits than its factorization.

21430843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13721.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21430843 is about 4629.3458501175. The cubic root of 21430843 is about 277.7664264813.

The spelling of 21430843 in words is "twenty-one million, four hundred thirty thousand, eight hundred forty-three".