27225721 has 16 divisors (see below), whose sum is σ = 30326400. Its totient is φ = 24310528.

The previous prime is 27225701. The next prime is 27225739. The reversal of 27225721 is 12752272.

It is a cyclic number.

It is not a de Polignac number, because 27225721 - 2¹⁷ = 27094649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27225721.

It is not an unprimeable number, because it can be changed into a prime (27225701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69795 + ... + 70183.

It is an arithmetic number, because the mean of its divisors is an integer number (1895400).

Almost surely, 2^27225721 is an apocalyptic number.

It is an amenable number.

27225721 is a deficient number, since it is larger than the sum of its proper divisors (3100679).

27225721 is a wasteful number, since it uses less digits than its factorization.

27225721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its digits is 3920, while the sum is 28.

The square root of 27225721 is about 5217.8272297959. The cubic root of 27225721 is about 300.8336847899.

Adding to 27225721 its reverse (12752272), we get a palindrome (39977993).

The spelling of 27225721 in words is "twenty-seven million, two hundred twenty-five thousand, seven hundred twenty-one".