21834826 has 8 divisors (see below), whose sum is σ = 35271684. Its totient is φ = 10077600.

The previous prime is 21834823. The next prime is 21834833. The reversal of 21834826 is 62843812.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 720801 = 4595^2 + 849^2 .

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 = 21834791 and 21834800.

It is not an unprimeable number, because it can be changed into a prime (21834821) by changing a digit.

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, 419875 + ... + 419926.

Almost surely, 2^21834826 is an apocalyptic number.

21834826 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21834826 is a deficient number, since it is larger than the sum of its proper divisors (13436858).

21834826 is a wasteful number, since it uses less digits than its factorization.

21834826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839816.

The product of its digits is 18432, while the sum is 34.

The square root of 21834826 is about 4672.7749785326. The cubic root of 21834826 is about 279.5009221864.

The spelling of 21834826 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred twenty-six".