21441996 has 30 divisors (see below), whose sum is σ = 56054460. Its totient is φ = 7147224.

The previous prime is 21441989. The next prime is 21442009. The reversal of 21441996 is 69914412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21441996.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 32766 + ... + 33413.

It is an arithmetic number, because the mean of its divisors is an integer number (1868482).

Almost surely, 2^21441996 is an apocalyptic number.

It is an amenable number.

21441996 is an abundant number, since it is smaller than the sum of its proper divisors (34612464).

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

21441996 is a wasteful number, since it uses less digits than its factorization.

21441996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66195 (or 66184 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21441996 is about 4630.5502912721. The cubic root of 21441996 is about 277.8146030230.

The spelling of 21441996 in words is "twenty-one million, four hundred forty-one thousand, nine hundred ninety-six".