21738883 has 4 divisors (see below), whose sum is σ = 21762648. Its totient is φ = 21715120.

The previous prime is 21738877. The next prime is 21738901. The reversal of 21738883 is 38883712.

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

It is a cyclic number.

It is not a de Polignac number, because 21738883 - 2¹⁷ = 21607811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10453 + ... + 12358.

It is an arithmetic number, because the mean of its divisors is an integer number (5440662).

Almost surely, 2^21738883 is an apocalyptic number.

21738883 is a deficient number, since it is larger than the sum of its proper divisors (23765).

21738883 is an equidigital number, since it uses as much as digits as its factorization.

21738883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23764.

The product of its digits is 64512, while the sum is 40.

The square root of 21738883 is about 4662.4975067017. The cubic root of 21738883 is about 279.0909421208.

The spelling of 21738883 in words is "twenty-one million, seven hundred thirty-eight thousand, eight hundred eighty-three".