21327256 has 32 divisors (see below), whose sum is σ = 43084800. Its totient is φ = 9868320.

The previous prime is 21327227. The next prime is 21327259. The reversal of 21327256 is 65272312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3835 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (1346400).

Almost surely, 2^21327256 is an apocalyptic number.

It is an amenable number.

21327256 is an abundant number, since it is smaller than the sum of its proper divisors (21757544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21327256 is a wasteful number, since it uses less digits than its factorization.

21327256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3799 (or 3795 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 21327256 is about 4618.1442160244. The cubic root of 21327256 is about 277.3181710666.

Adding to 21327256 its reverse (65272312), we get a palindrome (86599568).

It can be divided in two parts, 213 and 27256, that multiplied together give a triangular number (5805528 = T₃₄₀₇).

The spelling of 21327256 in words is "twenty-one million, three hundred twenty-seven thousand, two hundred fifty-six".