21834385 has 8 divisors (see below), whose sum is σ = 27046656. Its totient is φ = 16903920.

The previous prime is 21834353. The next prime is 21834391. The reversal of 21834385 is 58343812.

It is a happy number.

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

It is not a de Polignac number, because 21834385 - 2⁵ = 21834353 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21834385.

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 7 ways as a sum of consecutive naturals, for example, 70279 + ... + 70588.

It is an arithmetic number, because the mean of its divisors is an integer number (3380832).

Almost surely, 2^21834385 is an apocalyptic number.

It is an amenable number.

21834385 is a deficient number, since it is larger than the sum of its proper divisors (5212271).

21834385 is a wasteful number, since it uses less digits than its factorization.

21834385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140903.

The product of its digits is 23040, while the sum is 34.

The square root of 21834385 is about 4672.7277900601. The cubic root of 21834385 is about 279.4990404717.

The spelling of 21834385 in words is "twenty-one million, eight hundred thirty-four thousand, three hundred eighty-five".