21327075 has 72 divisors (see below), whose sum is σ = 47663616. Its totient is φ = 8856000.

The previous prime is 21327073. The next prime is 21327091. The reversal of 21327075 is 57072312.

It is not a de Polignac number, because 21327075 - 2¹ = 21327073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21327071) 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 71 ways as a sum of consecutive naturals, for example, 16710 + ... + 17940.

Almost surely, 2^21327075 is an apocalyptic number.

21327075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21327075 is an abundant number, since it is smaller than the sum of its proper divisors (26336541).

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

21327075 is a wasteful number, since it uses less digits than its factorization.

21327075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21327075 is about 4618.1246193666. The cubic root of 21327075 is about 277.3173865505.

Adding to 21327075 its reverse (57072312), we get a palindrome (78399387).

The spelling of 21327075 in words is "twenty-one million, three hundred twenty-seven thousand, seventy-five".