21040822 has 8 divisors (see below), whose sum is σ = 34430472. Its totient is φ = 9564000.

The previous prime is 21040807. The next prime is 21040879. The reversal of 21040822 is 22804012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21040822.

It is a congruent number.

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, 478179 + ... + 478222.

It is an arithmetic number, because the mean of its divisors is an integer number (4303809).

Almost surely, 2^21040822 is an apocalyptic number.

21040822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21040822 is a deficient number, since it is larger than the sum of its proper divisors (13389650).

21040822 is a wasteful number, since it uses less digits than its factorization.

21040822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956414.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 21040822 is about 4587.0275778547. The cubic root of 21040822 is about 276.0710714542.

Adding to 21040822 its reverse (22804012), we get a palindrome (43844834).

The spelling of 21040822 in words is "twenty-one million, forty thousand, eight hundred twenty-two".