21058843 has 16 divisors (see below), whose sum is σ = 23778720. Its totient is φ = 18514944.

The previous prime is 21058819. The next prime is 21058853. The reversal of 21058843 is 34885012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21058843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21058853) 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 15 ways as a sum of consecutive naturals, for example, 30955 + ... + 31627.

It is an arithmetic number, because the mean of its divisors is an integer number (1486170).

Almost surely, 2^21058843 is an apocalyptic number.

21058843 is a deficient number, since it is larger than the sum of its proper divisors (2719877).

21058843 is a wasteful number, since it uses less digits than its factorization.

21058843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21058843 is about 4588.9915014086. The cubic root of 21058843 is about 276.1498652248.

The spelling of 21058843 in words is "twenty-one million, fifty-eight thousand, eight hundred forty-three".