21896412 has 12 divisors (see below), whose sum is σ = 51091656. Its totient is φ = 7298800.

The previous prime is 21896411. The next prime is 21896443. The reversal of 21896412 is 21469812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21896411) 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 3 ways as a sum of consecutive naturals, for example, 912339 + ... + 912362.

It is an arithmetic number, because the mean of its divisors is an integer number (4257638).

Almost surely, 2^21896412 is an apocalyptic number.

It is an amenable number.

21896412 is an abundant number, since it is smaller than the sum of its proper divisors (29195244).

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

21896412 is a wasteful number, since it uses less digits than its factorization.

21896412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824708 (or 1824706 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 21896412 is about 4679.3602126787. The cubic root of 21896412 is about 279.7634566876.

The spelling of 21896412 in words is "twenty-one million, eight hundred ninety-six thousand, four hundred twelve".