21440982 has 16 divisors (see below), whose sum is σ = 44041392. Its totient is φ = 6953760.

The previous prime is 21440941. The next prime is 21440989. The reversal of 21440982 is 28904412.

It is a super-3 number, since 3×21440982³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440989) 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 7 ways as a sum of consecutive naturals, for example, 48069 + ... + 48512.

It is an arithmetic number, because the mean of its divisors is an integer number (2752587).

Almost surely, 2^21440982 is an apocalyptic number.

21440982 is an abundant number, since it is smaller than the sum of its proper divisors (22600410).

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

21440982 is a wasteful number, since it uses less digits than its factorization.

21440982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96623.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21440982 is about 4630.4407997511. The cubic root of 21440982 is about 277.8102236352.

It can be divided in two parts, 21440 and 982, that added together give a palindrome (22422).

The spelling of 21440982 in words is "twenty-one million, four hundred forty thousand, nine hundred eighty-two".