21583043 has 2 divisors, whose sum is σ = 21583044. Its totient is φ = 21583042.

The previous prime is 21583027. The next prime is 21583063. The reversal of 21583043 is 34038512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21583043 - 2⁴ = 21583027 is a prime.

It is not a weakly prime, because it can be changed into another prime (21583063) 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 as a sum of consecutive naturals, namely, 10791521 + 10791522.

It is an arithmetic number, because the mean of its divisors is an integer number (10791522).

Almost surely, 2^21583043 is an apocalyptic number.

21583043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21583043 is an equidigital number, since it uses as much as digits as its factorization.

21583043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21583043 is about 4645.7553745328. The cubic root of 21583043 is about 278.4224336953.

The spelling of 21583043 in words is "twenty-one million, five hundred eighty-three thousand, forty-three".