21241982 has 4 divisors (see below), whose sum is σ = 31862976. Its totient is φ = 10620990.

The previous prime is 21241973. The next prime is 21241991. The reversal of 21241982 is 28914212.

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

It is an interprime number because it is at equal distance from previous prime (21241973) and next prime (21241991).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310494 + ... + 5310497.

It is an arithmetic number, because the mean of its divisors is an integer number (7965744).

Almost surely, 2^21241982 is an apocalyptic number.

21241982 is a deficient number, since it is larger than the sum of its proper divisors (10620994).

21241982 is a wasteful number, since it uses less digits than its factorization.

21241982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620993.

The product of its digits is 2304, while the sum is 29.

The square root of 21241982 is about 4608.9024723897. The cubic root of 21241982 is about 276.9480716083.

The spelling of 21241982 in words is "twenty-one million, two hundred forty-one thousand, nine hundred eighty-two".