21227361 has 8 divisors (see below), whose sum is σ = 28389984. Its totient is φ = 14108160.

The previous prime is 21227357. The next prime is 21227363. The reversal of 21227361 is 16372212.

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

It is not a de Polignac number, because 21227361 - 2² = 21227357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21227363) 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 7 ways as a sum of consecutive naturals, for example, 9696 + ... + 11681.

It is an arithmetic number, because the mean of its divisors is an integer number (3548748).

Almost surely, 2^21227361 is an apocalyptic number.

It is an amenable number.

21227361 is a deficient number, since it is larger than the sum of its proper divisors (7162623).

21227361 is a wasteful number, since it uses less digits than its factorization.

21227361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21711.

The product of its digits is 1008, while the sum is 24.

The square root of 21227361 is about 4607.3160299680. The cubic root of 21227361 is about 276.8845152799.

Adding to 21227361 its reverse (16372212), we get a palindrome (37599573).

The spelling of 21227361 in words is "twenty-one million, two hundred twenty-seven thousand, three hundred sixty-one".