21027063 has 8 divisors (see below), whose sum is σ = 28793968. Its totient is φ = 13639104.

The previous prime is 21027049. The next prime is 21027067. The reversal of 21027063 is 36072012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21027063 - 2⁵ = 21027031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027067) 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 in 7 ways as a sum of consecutive naturals, for example, 94606 + ... + 94827.

It is an arithmetic number, because the mean of its divisors is an integer number (3599246).

Almost surely, 2^21027063 is an apocalyptic number.

21027063 is a deficient number, since it is larger than the sum of its proper divisors (7766905).

21027063 is a wasteful number, since it uses less digits than its factorization.

21027063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189473.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21027063 is about 4585.5275596162. The cubic root of 21027063 is about 276.0108822636.

Adding to 21027063 its reverse (36072012), we get a palindrome (57099075).

The spelling of 21027063 in words is "twenty-one million, twenty-seven thousand, sixty-three".