21049027 has 2 divisors, whose sum is σ = 21049028. Its totient is φ = 21049026.

The previous prime is 21049019. The next prime is 21049103. The reversal of 21049027 is 72094012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21049027 - 2³ = 21049019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21048992 and 21049010.

It is not a weakly prime, because it can be changed into another prime (21049627) 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, 10524513 + 10524514.

It is an arithmetic number, because the mean of its divisors is an integer number (10524514).

Almost surely, 2^21049027 is an apocalyptic number.

21049027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21049027 is an equidigital number, since it uses as much as digits as its factorization.

21049027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21049027 is about 4587.9218607121. The cubic root of 21049027 is about 276.1069520037.

The spelling of 21049027 in words is "twenty-one million, forty-nine thousand, twenty-seven".