21321412 has 24 divisors (see below), whose sum is σ = 43062656. Its totient is φ = 9047808.

The previous prime is 21321407. The next prime is 21321431. The reversal of 21321412 is 21412312.

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 in 7 ways as a sum of consecutive naturals, for example, 813 + ... + 6580.

Almost surely, 2^21321412 is an apocalyptic number.

It is an amenable number.

21321412 is an abundant number, since it is smaller than the sum of its proper divisors (21741244).

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

21321412 is a wasteful number, since it uses less digits than its factorization.

21321412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507 (or 7505 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21321412 is about 4617.5114509874. The cubic root of 21321412 is about 277.2928389213.

Adding to 21321412 its reverse (21412312), we get a palindrome (42733724).

The spelling of 21321412 in words is "twenty-one million, three hundred twenty-one thousand, four hundred twelve".