21006382 has 16 divisors (see below), whose sum is σ = 32704560. Its totient is φ = 10107328.

The previous prime is 21006379. The next prime is 21006397. The reversal of 21006382 is 28360012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33738 + ... + 34354.

It is an arithmetic number, because the mean of its divisors is an integer number (2044035).

Almost surely, 2^21006382 is an apocalyptic number.

21006382 is a deficient number, since it is larger than the sum of its proper divisors (11698178).

21006382 is a wasteful number, since it uses less digits than its factorization.

21006382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21006382 is about 4583.2719753469. The cubic root of 21006382 is about 275.9203631472.

Adding to 21006382 its reverse (28360012), we get a palindrome (49366394).

The spelling of 21006382 in words is "twenty-one million, six thousand, three hundred eighty-two".