21227773 has 8 divisors (see below), whose sum is σ = 24288192. Its totient is φ = 18174336.

The previous prime is 21227753. The next prime is 21227779. The reversal of 21227773 is 37772212.

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 21227773 - 2¹³ = 21219581 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 (21227779) 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, 10986 + ... + 12772.

It is an arithmetic number, because the mean of its divisors is an integer number (3036024).

Almost surely, 2^21227773 is an apocalyptic number.

It is an amenable number.

21227773 is a deficient number, since it is larger than the sum of its proper divisors (3060419).

21227773 is a wasteful number, since it uses less digits than its factorization.

21227773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491.

The product of its digits is 8232, while the sum is 31.

The square root of 21227773 is about 4607.3607412487. The cubic root of 21227773 is about 276.8863066107.

Adding to 21227773 its reverse (37772212), we get a palindrome (58999985).

The spelling of 21227773 in words is "twenty-one million, two hundred twenty-seven thousand, seven hundred seventy-three".