21150043 has 2 divisors, whose sum is σ = 21150044. Its totient is φ = 21150042.

The previous prime is 21150037. The next prime is 21150061. The reversal of 21150043 is 34005112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21150043 - 2⁵ = 21150011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21149999 and 21150026.

It is not a weakly prime, because it can be changed into another prime (21150083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575021 + 10575022.

It is an arithmetic number, because the mean of its divisors is an integer number (10575022).

Almost surely, 2^21150043 is an apocalyptic number.

21150043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150043 is an equidigital number, since it uses as much as digits as its factorization.

21150043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21150043 is about 4598.9175900422. The cubic root of 21150043 is about 276.5479339238.

Adding to 21150043 its reverse (34005112), we get a palindrome (55155155).

The spelling of 21150043 in words is "twenty-one million, one hundred fifty thousand, forty-three".