21984801 has 16 divisors (see below), whose sum is σ = 29808000. Its totient is φ = 14411648.

The previous prime is 21984793. The next prime is 21984811. The reversal of 21984801 is 10848912.

It is a cyclic number.

It is not a de Polignac number, because 21984801 - 2³ = 21984793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21984811) 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 15 ways as a sum of consecutive naturals, for example, 61060 + ... + 61418.

It is an arithmetic number, because the mean of its divisors is an integer number (1863000).

Almost surely, 2^21984801 is an apocalyptic number.

It is an amenable number.

21984801 is a deficient number, since it is larger than the sum of its proper divisors (7823199).

21984801 is a wasteful number, since it uses less digits than its factorization.

21984801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 21984801 is about 4688.7952610452. The cubic root of 21984801 is about 280.1393906305.

The spelling of 21984801 in words is "twenty-one million, nine hundred eighty-four thousand, eight hundred one".