21996012 has 12 divisors (see below), whose sum is σ = 51324056. Its totient is φ = 7332000.

The previous prime is 21996001. The next prime is 21996041. The reversal of 21996012 is 21069912.

It is a happy number.

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

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, 916489 + ... + 916512.

Almost surely, 2^21996012 is an apocalyptic number.

It is an amenable number.

21996012 is an abundant number, since it is smaller than the sum of its proper divisors (29328044).

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

21996012 is a wasteful number, since it uses less digits than its factorization.

21996012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833008 (or 1833006 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 21996012 is about 4689.9906183275. The cubic root of 21996012 is about 280.1870009320.

The spelling of 21996012 in words is "twenty-one million, nine hundred ninety-six thousand, twelve".