21227774 has 8 divisors (see below), whose sum is σ = 32244960. Its totient is φ = 10479456.

The previous prime is 21227753. The next prime is 21227779. The reversal of 21227774 is 47772212.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21227774.

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 3 ways as a sum of consecutive naturals, for example, 67019 + ... + 67334.

It is an arithmetic number, because the mean of its divisors is an integer number (4030620).

Almost surely, 2^21227774 is an apocalyptic number.

21227774 is a deficient number, since it is larger than the sum of its proper divisors (11017186).

21227774 is a wasteful number, since it uses less digits than its factorization.

21227774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134434.

The product of its digits is 10976, while the sum is 32.

The square root of 21227774 is about 4607.3608497707. The cubic root of 21227774 is about 276.8863109586.

Adding to 21227774 its reverse (47772212), we get a palindrome (68999986).

The spelling of 21227774 in words is "twenty-one million, two hundred twenty-seven thousand, seven hundred seventy-four".