21838063 has 8 divisors (see below), whose sum is σ = 24540768. Its totient is φ = 19281504.

The previous prime is 21838057. The next prime is 21838099. The reversal of 21838063 is 36083812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21838063 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 (21838763) 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, 36220 + ... + 36817.

It is an arithmetic number, because the mean of its divisors is an integer number (3067596).

Almost surely, 2^21838063 is an apocalyptic number.

21838063 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21838063 is a deficient number, since it is larger than the sum of its proper divisors (2702705).

21838063 is a wasteful number, since it uses less digits than its factorization.

21838063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73073.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21838063 is about 4673.1213337554. The cubic root of 21838063 is about 279.5147334525.

The spelling of 21838063 in words is "twenty-one million, eight hundred thirty-eight thousand, sixty-three".