21984754 has 8 divisors (see below), whose sum is σ = 35975088. Its totient is φ = 9993060.

The previous prime is 21984751. The next prime is 21984763. The reversal of 21984754 is 45748912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21984751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499632 + ... + 499675.

It is an arithmetic number, because the mean of its divisors is an integer number (4496886).

Almost surely, 2^21984754 is an apocalyptic number.

21984754 is a deficient number, since it is larger than the sum of its proper divisors (13990334).

21984754 is a wasteful number, since it uses less digits than its factorization.

21984754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999320.

The product of its digits is 80640, while the sum is 40.

The square root of 21984754 is about 4688.7902490941. The cubic root of 21984754 is about 280.1391909993.

The spelling of 21984754 in words is "twenty-one million, nine hundred eighty-four thousand, seven hundred fifty-four".