21412812 has 12 divisors (see below), whose sum is σ = 49963256. Its totient is φ = 7137600.

The previous prime is 21412801. The next prime is 21412823. The reversal of 21412812 is 21821412.

It is an interprime number because it is at equal distance from previous prime (21412801) and next prime (21412823).

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 16.

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, 892189 + ... + 892212.

Almost surely, 2^21412812 is an apocalyptic number.

It is an amenable number.

21412812 is an abundant number, since it is smaller than the sum of its proper divisors (28550444).

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

21412812 is a wasteful number, since it uses less digits than its factorization.

21412812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784408 (or 1784406 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

The square root of 21412812 is about 4627.3979729433. The cubic root of 21412812 is about 277.6885043372.

The spelling of 21412812 in words is "twenty-one million, four hundred twelve thousand, eight hundred twelve".