21938063 has 8 divisors (see below), whose sum is σ = 25390080. Its totient is φ = 18565560.

The previous prime is 21938057. The next prime is 21938083. The reversal of 21938063 is 36083912.

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 21938063 - 2⁸ = 21937807 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 (21938023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19283 + ... + 20388.

It is an arithmetic number, because the mean of its divisors is an integer number (3173760).

Almost surely, 2^21938063 is an apocalyptic number.

21938063 is a deficient number, since it is larger than the sum of its proper divisors (3452017).

21938063 is an equidigital number, since it uses as much as digits as its factorization.

21938063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39757.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21938063 is about 4683.8085998469. The cubic root of 21938063 is about 279.9407315030.

The spelling of 21938063 in words is "twenty-one million, nine hundred thirty-eight thousand, sixty-three".