21241227 has 16 divisors (see below), whose sum is σ = 33057792. Its totient is φ = 11879040.

The previous prime is 21241223. The next prime is 21241229. The reversal of 21241227 is 72214212.

It is not a de Polignac number, because 21241227 - 2² = 21241223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21241223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9774 + ... + 11747.

It is an arithmetic number, because the mean of its divisors is an integer number (2066112).

Almost surely, 2^21241227 is an apocalyptic number.

21241227 is a deficient number, since it is larger than the sum of its proper divisors (11816565).

21241227 is a wasteful number, since it uses less digits than its factorization.

21241227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21578.

The product of its digits is 448, while the sum is 21.

The square root of 21241227 is about 4608.8205649602. The cubic root of 21241227 is about 276.9447903974.

Adding to 21241227 its reverse (72214212), we get a palindrome (93455439).

The spelling of 21241227 in words is "twenty-one million, two hundred forty-one thousand, two hundred twenty-seven".