21112043 has 2 divisors, whose sum is σ = 21112044. Its totient is φ = 21112042.

The previous prime is 21112037. The next prime is 21112061. The reversal of 21112043 is 34021112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112043 - 2¹⁶ = 21046507 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112093) 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, 10556021 + 10556022.

It is an arithmetic number, because the mean of its divisors is an integer number (10556022).

Almost surely, 2^21112043 is an apocalyptic number.

21112043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112043 is an equidigital number, since it uses as much as digits as its factorization.

21112043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21112043 is about 4594.7843257328. The cubic root of 21112043 is about 276.3822113062.

Adding to 21112043 its reverse (34021112), we get a palindrome (55133155).

The spelling of 21112043 in words is "twenty-one million, one hundred twelve thousand, forty-three".