21676063 has 4 divisors (see below), whose sum is σ = 21715128. Its totient is φ = 21637000.

The previous prime is 21676033. The next prime is 21676091. The reversal of 21676063 is 36067612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21676063 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676033) 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, 18688 + ... + 19813.

It is an arithmetic number, because the mean of its divisors is an integer number (5428782).

Almost surely, 2^21676063 is an apocalyptic number.

21676063 is a deficient number, since it is larger than the sum of its proper divisors (39065).

21676063 is an equidigital number, since it uses as much as digits as its factorization.

21676063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39064.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 21676063 is about 4655.7558999587. The cubic root of 21676063 is about 278.8218481301.

The spelling of 21676063 in words is "twenty-one million, six hundred seventy-six thousand, sixty-three".