21041227 has 4 divisors (see below), whose sum is σ = 22148680. Its totient is φ = 19933776.

The previous prime is 21041221. The next prime is 21041239. The reversal of 21041227 is 72214012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21041227 - 2⁷ = 21041099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1107433 = 21041227 / (2 + 1 + 0 + 4 + 1 + 2 + 2 + 7).

It is not an unprimeable number, because it can be changed into a prime (21041221) 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, 553698 + ... + 553735.

It is an arithmetic number, because the mean of its divisors is an integer number (5537170).

Almost surely, 2^21041227 is an apocalyptic number.

21041227 is a deficient number, since it is larger than the sum of its proper divisors (1107453).

21041227 is a wasteful number, since it uses less digits than its factorization.

21041227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107452.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21041227 is about 4587.0717238779. The cubic root of 21041227 is about 276.0728427422.

Adding to 21041227 its reverse (72214012), we get a palindrome (93255239).

The spelling of 21041227 in words is "twenty-one million, forty-one thousand, two hundred twenty-seven".