21027227 has 8 divisors (see below), whose sum is σ = 22693776. Its totient is φ = 19367712.

The previous prime is 21027179. The next prime is 21027239. The reversal of 21027227 is 72272012.

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

It is not a de Polignac number, because 21027227 - 2¹⁸ = 20765083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21027257) 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, 5633 + ... + 8589.

It is an arithmetic number, because the mean of its divisors is an integer number (2836722).

Almost surely, 2^21027227 is an apocalyptic number.

21027227 is a deficient number, since it is larger than the sum of its proper divisors (1666549).

21027227 is a wasteful number, since it uses less digits than its factorization.

21027227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21027227 is about 4585.5454419295. The cubic root of 21027227 is about 276.0115998415.

Adding to 21027227 its reverse (72272012), we get a palindrome (93299239).

The spelling of 21027227 in words is "twenty-one million, twenty-seven thousand, two hundred twenty-seven".