21945996 has 36 divisors (see below), whose sum is σ = 56768712. Its totient is φ = 7144704.

The previous prime is 21945977. The next prime is 21946003. The reversal of 21945996 is 69954912.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5541 + ... + 8636.

Almost surely, 2^21945996 is an apocalyptic number.

It is an amenable number.

21945996 is an abundant number, since it is smaller than the sum of its proper divisors (34822716).

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

21945996 is a wasteful number, since it uses less digits than its factorization.

21945996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14230 (or 14225 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 21945996 is about 4684.6553768661. The cubic root of 21945996 is about 279.9744704615.

The spelling of 21945996 in words is "twenty-one million, nine hundred forty-five thousand, nine hundred ninety-six".