21773271 has 8 divisors (see below), whose sum is σ = 31264240. Its totient is φ = 13398912.

The previous prime is 21773251. The next prime is 21773281. The reversal of 21773271 is 17237712.

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

It is not a de Polignac number, because 21773271 - 2⁵ = 21773239 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 (21773201) 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, 279106 + ... + 279183.

It is an arithmetic number, because the mean of its divisors is an integer number (3908030).

Almost surely, 2^21773271 is an apocalyptic number.

21773271 is a deficient number, since it is larger than the sum of its proper divisors (9490969).

21773271 is a wasteful number, since it uses less digits than its factorization.

21773271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558305.

The product of its digits is 4116, while the sum is 30.

The square root of 21773271 is about 4666.1837726348. The cubic root of 21773271 is about 279.2380260835.

The spelling of 21773271 in words is "twenty-one million, seven hundred seventy-three thousand, two hundred seventy-one".