21548982 has 64 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 5581440.

The previous prime is 21548981. The next prime is 21548993. The reversal of 21548982 is 28984512.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 21548982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21548981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32983 + ... + 33629.

It is an arithmetic number, because the mean of its divisors is an integer number (843696).

Almost surely, 2^21548982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21548982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998272).

21548982 is an abundant number, since it is smaller than the sum of its proper divisors (32447562).

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

21548982 is a wasteful number, since it uses less digits than its factorization.

21548982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733.

The product of its digits is 46080, while the sum is 39.

The square root of 21548982 is about 4642.0881077377. The cubic root of 21548982 is about 278.2758936613.

The spelling of 21548982 in words is "twenty-one million, five hundred forty-eight thousand, nine hundred eighty-two".