21027826 has 8 divisors (see below), whose sum is σ = 31561200. Its totient is φ = 10507428.

The previous prime is 21027791. The next prime is 21027833. The reversal of 21027826 is 62872012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21027794 and 21027803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4725 + ... + 8023.

It is an arithmetic number, because the mean of its divisors is an integer number (3945150).

Almost surely, 2^21027826 is an apocalyptic number.

21027826 is a deficient number, since it is larger than the sum of its proper divisors (10533374).

21027826 is a wasteful number, since it uses less digits than its factorization.

21027826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21027826 is about 4585.6107553956. The cubic root of 21027826 is about 276.0142207194.

Adding to 21027826 its reverse (62872012), we get a palindrome (83899838).

The spelling of 21027826 in words is "twenty-one million, twenty-seven thousand, eight hundred twenty-six".