21834318 has 16 divisors (see below), whose sum is σ = 47638656. Its totient is φ = 6616440.

The previous prime is 21834277. The next prime is 21834331. The reversal of 21834318 is 81343812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165346 + ... + 165477.

It is an arithmetic number, because the mean of its divisors is an integer number (2977416).

Almost surely, 2^21834318 is an apocalyptic number.

21834318 is an abundant number, since it is smaller than the sum of its proper divisors (25804338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21834318 is a wasteful number, since it uses less digits than its factorization.

21834318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330839.

The product of its digits is 4608, while the sum is 30.

The square root of 21834318 is about 4672.7206207947. The cubic root of 21834318 is about 279.4987545854.

The spelling of 21834318 in words is "twenty-one million, eight hundred thirty-four thousand, three hundred eighteen".