21327277 has 4 divisors (see below), whose sum is σ = 21340800. Its totient is φ = 21313756.

The previous prime is 21327263. The next prime is 21327289. The reversal of 21327277 is 77272312.

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 21327277 - 2⁷ = 21327149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327227) 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, 4027 + ... + 7672.

It is an arithmetic number, because the mean of its divisors is an integer number (5335200).

Almost surely, 2^21327277 is an apocalyptic number.

It is an amenable number.

21327277 is a deficient number, since it is larger than the sum of its proper divisors (13523).

21327277 is a wasteful number, since it uses less digits than its factorization.

21327277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13522.

The product of its digits is 8232, while the sum is 31.

The square root of 21327277 is about 4618.1464896644. The cubic root of 21327277 is about 277.3182620875.

Adding to 21327277 its reverse (77272312), we get a palindrome (98599589).

It can be divided in two parts, 2132 and 7277, that added together give a square (9409 = 97²).

The spelling of 21327277 in words is "twenty-one million, three hundred twenty-seven thousand, two hundred seventy-seven".