21063763 has 8 divisors (see below), whose sum is σ = 24116832. Its totient is φ = 18021696.

The previous prime is 21063751. The next prime is 21063769. The reversal of 21063763 is 36736012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21063763 is a prime.

It is a super-2 number, since 2×21063763² = 887364223440338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21063769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881 + ... + 6757.

It is an arithmetic number, because the mean of its divisors is an integer number (3014604).

Almost surely, 2^21063763 is an apocalyptic number.

21063763 is a deficient number, since it is larger than the sum of its proper divisors (3053069).

21063763 is an equidigital number, since it uses as much as digits as its factorization.

21063763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5501.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21063763 is about 4589.5275355967. The cubic root of 21063763 is about 276.1713692796.

Adding to 21063763 its reverse (36736012), we get a palindrome (57799775).

The spelling of 21063763 in words is "twenty-one million, sixty-three thousand, seven hundred sixty-three".