21802082 has 8 divisors (see below), whose sum is σ = 34424400. Its totient is φ = 10327284.

The previous prime is 21802051. The next prime is 21802097. The reversal of 21802082 is 28020812.

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

It is an unprimeable number.

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, 286832 + ... + 286907.

It is an arithmetic number, because the mean of its divisors is an integer number (4303050).

Almost surely, 2^21802082 is an apocalyptic number.

21802082 is a deficient number, since it is larger than the sum of its proper divisors (12622318).

21802082 is a wasteful number, since it uses less digits than its factorization.

21802082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573760.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 21802082 is about 4669.2699643520. The cubic root of 21802082 is about 279.3611369819.

Adding to 21802082 its reverse (28020812), we get a palindrome (49822894).

The spelling of 21802082 in words is "twenty-one million, eight hundred two thousand, eighty-two".