21127227 has 8 divisors (see below), whose sum is σ = 30730560. Its totient is φ = 12804360.

The previous prime is 21127217. The next prime is 21127241. The reversal of 21127227 is 72272112.

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

It is not a de Polignac number, because 21127227 - 2¹⁸ = 20865083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21127197 and 21127206.

It is not an unprimeable number, because it can be changed into a prime (21127217) 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, 320077 + ... + 320142.

It is an arithmetic number, because the mean of its divisors is an integer number (3841320).

Almost surely, 2^21127227 is an apocalyptic number.

21127227 is a deficient number, since it is larger than the sum of its proper divisors (9603333).

21127227 is a wasteful number, since it uses less digits than its factorization.

21127227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640233.

The product of its digits is 784, while the sum is 24.

The square root of 21127227 is about 4596.4363369898. The cubic root of 21127227 is about 276.4484544109.

Adding to 21127227 its reverse (72272112), we get a palindrome (93399339).

It can be divided in two parts, 2112 and 7227, that added together give a palindrome (9339).

The spelling of 21127227 in words is "twenty-one million, one hundred twenty-seven thousand, two hundred twenty-seven".