21340826 has 32 divisors (see below), whose sum is σ = 36384768. Its totient is φ = 9313920.

The previous prime is 21340811. The next prime is 21340859. The reversal of 21340826 is 62804312.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 21340795 and 21340804.

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 15 ways as a sum of consecutive naturals, for example, 75806 + ... + 76086.

It is an arithmetic number, because the mean of its divisors is an integer number (1137024).

Almost surely, 2^21340826 is an apocalyptic number.

21340826 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21340826 is a deficient number, since it is larger than the sum of its proper divisors (15043942).

21340826 is a wasteful number, since it uses less digits than its factorization.

21340826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21340826 is about 4619.6131872701. The cubic root of 21340826 is about 277.3769754704.

The spelling of 21340826 in words is "twenty-one million, three hundred forty thousand, eight hundred twenty-six".