21159982 has 8 divisors (see below), whose sum is σ = 31761216. Its totient is φ = 10572912.

The previous prime is 21159973. The next prime is 21160001. The reversal of 21159982 is 28995112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1818 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (3970152).

Almost surely, 2^21159982 is an apocalyptic number.

21159982 is a deficient number, since it is larger than the sum of its proper divisors (10601234).

21159982 is a wasteful number, since it uses less digits than its factorization.

21159982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082.

The product of its digits is 12960, while the sum is 37.

The square root of 21159982 is about 4599.9980434778. The cubic root of 21159982 is about 276.5912463571.

The spelling of 21159982 in words is "twenty-one million, one hundred fifty-nine thousand, nine hundred eighty-two".