21927063 has 4 divisors (see below), whose sum is σ = 29236088. Its totient is φ = 14618040.

The previous prime is 21927053. The next prime is 21927067. The reversal of 21927063 is 36072912.

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

It is not a de Polignac number, because 21927063 - 2²⁴ = 5149847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21927063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927067) 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 3 ways as a sum of consecutive naturals, for example, 3654508 + ... + 3654513.

It is an arithmetic number, because the mean of its divisors is an integer number (7309022).

Almost surely, 2^21927063 is an apocalyptic number.

21927063 is a deficient number, since it is larger than the sum of its proper divisors (7309025).

21927063 is an equidigital number, since it uses as much as digits as its factorization.

21927063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7309024.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21927063 is about 4682.6341945533. The cubic root of 21927063 is about 279.8939351675.

Adding to 21927063 its reverse (36072912), we get a palindrome (57999975).

The spelling of 21927063 in words is "twenty-one million, nine hundred twenty-seven thousand, sixty-three".