21441982 has 4 divisors (see below), whose sum is σ = 32162976. Its totient is φ = 10720990.

The previous prime is 21441967. The next prime is 21441989. The reversal of 21441982 is 28914412.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360494 + ... + 5360497.

It is an arithmetic number, because the mean of its divisors is an integer number (8040744).

Almost surely, 2^21441982 is an apocalyptic number.

21441982 is a deficient number, since it is larger than the sum of its proper divisors (10720994).

21441982 is a wasteful number, since it uses less digits than its factorization.

21441982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720993.

The product of its digits is 4608, while the sum is 31.

The square root of 21441982 is about 4630.5487795725. The cubic root of 21441982 is about 277.8145425590.

The spelling of 21441982 in words is "twenty-one million, four hundred forty-one thousand, nine hundred eighty-two".