21834395 has 16 divisors (see below), whose sum is σ = 28933632. Its totient is φ = 15684960.

The previous prime is 21834391. The next prime is 21834413. The reversal of 21834395 is 59343812.

It is not a de Polignac number, because 21834395 - 2² = 21834391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21834391) 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 15 ways as a sum of consecutive naturals, for example, 2174 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (1808352).

Almost surely, 2^21834395 is an apocalyptic number.

21834395 is a deficient number, since it is larger than the sum of its proper divisors (7099237).

21834395 is a wasteful number, since it uses less digits than its factorization.

21834395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882.

The product of its digits is 25920, while the sum is 35.

The square root of 21834395 is about 4672.7288600988. The cubic root of 21834395 is about 279.4990831412.

The spelling of 21834395 in words is "twenty-one million, eight hundred thirty-four thousand, three hundred ninety-five".