21050826 has 8 divisors (see below), whose sum is σ = 42101664. Its totient is φ = 7016940.

The previous prime is 21050807. The next prime is 21050833. The reversal of 21050826 is 62805012.

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

21050826 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21050796 and 21050805.

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, 1754230 + ... + 1754241.

It is an arithmetic number, because the mean of its divisors is an integer number (5262708).

Almost surely, 2^21050826 is an apocalyptic number.

21050826 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21050826 is a wasteful number, since it uses less digits than its factorization.

21050826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508476.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21050826 is about 4588.1179147882. The cubic root of 21050826 is about 276.1148178029.

Adding to 21050826 its reverse (62805012), we get a palindrome (83855838).

The spelling of 21050826 in words is "twenty-one million, fifty thousand, eight hundred twenty-six".