21063982 has 8 divisors (see below), whose sum is σ = 31635576. Its totient is φ = 10518792.

The previous prime is 21063907. The next prime is 21063983. The reversal of 21063982 is 28936012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468 + ... + 7879.

It is an arithmetic number, because the mean of its divisors is an integer number (3954447).

Almost surely, 2^21063982 is an apocalyptic number.

21063982 is a deficient number, since it is larger than the sum of its proper divisors (10571594).

21063982 is a wasteful number, since it uses less digits than its factorization.

21063982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13202.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 21063982 is about 4589.5513941997. The cubic root of 21063982 is about 276.1723263945.

Adding to 21063982 its reverse (28936012), we get a palindrome (49999994).

The spelling of 21063982 in words is "twenty-one million, sixty-three thousand, nine hundred eighty-two".