21797834 has 8 divisors (see below), whose sum is σ = 32794788. Its totient is φ = 10866240.

The previous prime is 21797833. The next prime is 21797843. The reversal of 21797834 is 43879712.

It can be written as a sum of positive squares in 2 ways, for example, as 19228225 + 2569609 = 4385^2 + 1603^2 .

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 = 21797791 and 21797800.

It is not an unprimeable number, because it can be changed into a prime (21797833) by changing a digit.

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, 15497 + ... + 16844.

Almost surely, 2^21797834 is an apocalyptic number.

21797834 is a deficient number, since it is larger than the sum of its proper divisors (10996954).

21797834 is a wasteful number, since it uses less digits than its factorization.

21797834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32680.

The product of its digits is 84672, while the sum is 41.

The square root of 21797834 is about 4668.8150530943. The cubic root of 21797834 is about 279.3429918770.

The spelling of 21797834 in words is "twenty-one million, seven hundred ninety-seven thousand, eight hundred thirty-four".