21327012 has 36 divisors (see below), whose sum is σ = 61612096. Its totient is φ = 6093360.

The previous prime is 21327001. The next prime is 21327013. The reversal of 21327012 is 21072312.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21327013) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 42064 + ... + 42567.

Almost surely, 2^21327012 is an apocalyptic number.

It is an amenable number.

21327012 is an abundant number, since it is smaller than the sum of its proper divisors (40285084).

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

21327012 is a wasteful number, since it uses less digits than its factorization.

21327012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84648 (or 84643 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21327012 is about 4618.1177984110. The cubic root of 21327012 is about 277.3171134858.

Adding to 21327012 its reverse (21072312), we get a palindrome (42399324).

It can be divided in two parts, 213 and 27012, that added together give a square (27225 = 165²).

The spelling of 21327012 in words is "twenty-one million, three hundred twenty-seven thousand, twelve".