21327056 has 10 divisors (see below), whose sum is σ = 41321202. Its totient is φ = 10663520.

The previous prime is 21327043. The next prime is 21327067. The reversal of 21327056 is 65072312.

It can be written as a sum of positive squares in only one way, i.e., 21307456 + 19600 = 4616^2 + 140^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 666455 + ... + 666486.

Almost surely, 2^21327056 is an apocalyptic number.

It is an amenable number.

21327056 is a deficient number, since it is larger than the sum of its proper divisors (19994146).

21327056 is a wasteful number, since it uses less digits than its factorization.

21327056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332949 (or 1332943 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21327056 is about 4618.1225622541. The cubic root of 21327056 is about 277.3173041977.

Adding to 21327056 its reverse (65072312), we get a palindrome (86399368).

The spelling of 21327056 in words is "twenty-one million, three hundred twenty-seven thousand, fifty-six".