21050027 has 4 divisors (see below), whose sum is σ = 21775920. Its totient is φ = 20324136.

The previous prime is 21050017. The next prime is 21050033. The reversal of 21050027 is 72005012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21050027 - 2⁴ = 21050011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21049987 and 21050014.

It is not an unprimeable number, because it can be changed into a prime (21050017) 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 in 3 ways as a sum of consecutive naturals, for example, 362903 + ... + 362960.

It is an arithmetic number, because the mean of its divisors is an integer number (5443980).

Almost surely, 2^21050027 is an apocalyptic number.

21050027 is a deficient number, since it is larger than the sum of its proper divisors (725893).

21050027 is an equidigital number, since it uses as much as digits as its factorization.

21050027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725892.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 21050027 is about 4588.0308412215. The cubic root of 21050027 is about 276.1113243765. Note that the first 3 decimals are identical.

Adding to 21050027 its reverse (72005012), we get a palindrome (93055039).

The spelling of 21050027 in words is "twenty-one million, fifty thousand, twenty-seven".