21984948 has 36 divisors (see below), whose sum is σ = 55832868. Its totient is φ = 7294080.

The previous prime is 21984947. The next prime is 21984967. The reversal of 21984948 is 84948912.

It can be written as a sum of positive squares in 2 ways, for example, as 11370384 + 10614564 = 3372^2 + 3258^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21984943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7078 + ... + 9698.

It is an arithmetic number, because the mean of its divisors is an integer number (1550913).

Almost surely, 2^21984948 is an apocalyptic number.

It is an amenable number.

21984948 is an abundant number, since it is smaller than the sum of its proper divisors (33847920).

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

21984948 is a wasteful number, since it uses less digits than its factorization.

21984948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 2859 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 21984948 is about 4688.8109366875. The cubic root of 21984948 is about 280.1400150073.

The spelling of 21984948 in words is "twenty-one million, nine hundred eighty-four thousand, nine hundred forty-eight".