21727022 has 4 divisors (see below), whose sum is σ = 32590536. Its totient is φ = 10863510.

The previous prime is 21727009. The next prime is 21727081. The reversal of 21727022 is 22072712.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5431754 + ... + 5431757.

It is an arithmetic number, because the mean of its divisors is an integer number (8147634).

Almost surely, 2^21727022 is an apocalyptic number.

21727022 is a deficient number, since it is larger than the sum of its proper divisors (10863514).

21727022 is a wasteful number, since it uses less digits than its factorization.

21727022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10863513.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21727022 is about 4661.2253753707. The cubic root of 21727022 is about 279.0401744112.

Adding to 21727022 its reverse (22072712), we get a palindrome (43799734).

The spelling of 21727022 in words is "twenty-one million, seven hundred twenty-seven thousand, twenty-two".