21834855 has 24 divisors (see below), whose sum is σ = 43254432. Its totient is φ = 9981504.

The previous prime is 21834833. The next prime is 21834859. The reversal of 21834855 is 55843812.

It is a happy number.

It is not a de Polignac number, because 21834855 - 2⁵ = 21834823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834859) 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 23 ways as a sum of consecutive naturals, for example, 34344 + ... + 34973.

It is an arithmetic number, because the mean of its divisors is an integer number (1802268).

Almost surely, 2^21834855 is an apocalyptic number.

21834855 is a deficient number, since it is larger than the sum of its proper divisors (21419577).

21834855 is a wasteful number, since it uses less digits than its factorization.

21834855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69335 (or 69332 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 21834855 is about 4672.7780816127. The cubic root of 21834855 is about 279.5010459263.

The spelling of 21834855 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred fifty-five".