21727077 has 4 divisors (see below), whose sum is σ = 28969440. Its totient is φ = 14484716.

The previous prime is 21727009. The next prime is 21727081. The reversal of 21727077 is 77072712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21727077 - 2⁷ = 21726949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3621177 + ... + 3621182.

It is an arithmetic number, because the mean of its divisors is an integer number (7242360).

Almost surely, 2^21727077 is an apocalyptic number.

It is an amenable number.

21727077 is a deficient number, since it is larger than the sum of its proper divisors (7242363).

21727077 is an equidigital number, since it uses as much as digits as its factorization.

21727077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242362.

The product of its (nonzero) digits is 9604, while the sum is 33.

The square root of 21727077 is about 4661.2312751032. The cubic root of 21727077 is about 279.0404098660.

Adding to 21727077 its reverse (77072712), we get a palindrome (98799789).

The spelling of 21727077 in words is "twenty-one million, seven hundred twenty-seven thousand, seventy-seven".