21332012 has 12 divisors (see below), whose sum is σ = 40202736. Its totient is φ = 9845520.

The previous prime is 21332009. The next prime is 21332029. The reversal of 21332012 is 21023312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205064 + ... + 205167.

It is an arithmetic number, because the mean of its divisors is an integer number (3350228).

Almost surely, 2^21332012 is an apocalyptic number.

It is an amenable number.

21332012 is a deficient number, since it is larger than the sum of its proper divisors (18870724).

21332012 is a wasteful number, since it uses less digits than its factorization.

21332012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410248 (or 410246 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21332012 is about 4618.6591127729. The cubic root of 21332012 is about 277.3387836135.

Adding to 21332012 its reverse (21023312), we get a palindrome (42355324).

The spelling of 21332012 in words is "twenty-one million, three hundred thirty-two thousand, twelve".