21775323 has 16 divisors (see below), whose sum is σ = 29657600. Its totient is φ = 14208480.

The previous prime is 21775321. The next prime is 21775339. The reversal of 21775323 is 32357712.

It is not a de Polignac number, because 21775323 - 2¹ = 21775321 is a prime.

It is a Duffinian number.

21775323 is a Rhonda number in base 10.

Its product of digits (8820) is a multiple of the sum of its prime divisors (882).

It is not an unprimeable number, because it can be changed into a prime (21775321) 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 15 ways as a sum of consecutive naturals, for example, 32613 + ... + 33273.

It is an arithmetic number, because the mean of its divisors is an integer number (1853600).

Almost surely, 2^21775323 is an apocalyptic number.

21775323 is a deficient number, since it is larger than the sum of its proper divisors (7882277).

21775323 is a wasteful number, since it uses less digits than its factorization.

21775323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882.

The product of its digits is 8820, while the sum is 30.

The square root of 21775323 is about 4666.4036473499. The cubic root of 21775323 is about 279.2467979768.

The spelling of 21775323 in words is "twenty-one million, seven hundred seventy-five thousand, three hundred twenty-three".