21230843 has 2 divisors, whose sum is σ = 21230844. Its totient is φ = 21230842.

The previous prime is 21230827. The next prime is 21230851. The reversal of 21230843 is 34803212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21230843 - 2⁴ = 21230827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615421 + 10615422.

It is an arithmetic number, because the mean of its divisors is an integer number (10615422).

Almost surely, 2^21230843 is an apocalyptic number.

21230843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230843 is an equidigital number, since it uses as much as digits as its factorization.

21230843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21230843 is about 4607.6938917424. The cubic root of 21230843 is about 276.8996539048.

The spelling of 21230843 in words is "twenty-one million, two hundred thirty thousand, eight hundred forty-three".