21368582 has 4 divisors (see below), whose sum is σ = 32052876. Its totient is φ = 10684290.

The previous prime is 21368569. The next prime is 21368591. The reversal of 21368582 is 28586312.

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

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, 5342144 + ... + 5342147.

It is an arithmetic number, because the mean of its divisors is an integer number (8013219).

Almost surely, 2^21368582 is an apocalyptic number.

21368582 is a deficient number, since it is larger than the sum of its proper divisors (10684294).

21368582 is a wasteful number, since it uses less digits than its factorization.

21368582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684293.

The product of its digits is 23040, while the sum is 35.

The square root of 21368582 is about 4622.6163587302. The cubic root of 21368582 is about 277.4971760663.

The spelling of 21368582 in words is "twenty-one million, three hundred sixty-eight thousand, five hundred eighty-two".