21827663 has 8 divisors (see below), whose sum is σ = 25643856. Its totient is φ = 18316800.

The previous prime is 21827651. The next prime is 21827683. The reversal of 21827663 is 36672812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21827663 - 2⁴ = 21827647 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 (21827623) 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 7 ways as a sum of consecutive naturals, for example, 76178 + ... + 76463.

It is an arithmetic number, because the mean of its divisors is an integer number (3205482).

Almost surely, 2^21827663 is an apocalyptic number.

21827663 is a deficient number, since it is larger than the sum of its proper divisors (3816193).

21827663 is a wasteful number, since it uses less digits than its factorization.

21827663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152665.

The product of its digits is 24192, while the sum is 35.

The square root of 21827663 is about 4672.0084546156. The cubic root of 21827663 is about 279.4703550536.

The spelling of 21827663 in words is "twenty-one million, eight hundred twenty-seven thousand, six hundred sixty-three".