21834818 has 8 divisors (see below), whose sum is σ = 33002640. Its totient is φ = 10833940.

The previous prime is 21834803. The next prime is 21834821. The reversal of 21834818 is 81843812.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41408 + ... + 41931.

It is an arithmetic number, because the mean of its divisors is an integer number (4125330).

Almost surely, 2^21834818 is an apocalyptic number.

21834818 is a deficient number, since it is larger than the sum of its proper divisors (11167822).

21834818 is a wasteful number, since it uses less digits than its factorization.

21834818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83472.

The product of its digits is 12288, while the sum is 35.

The square root of 21834818 is about 4672.7741225101. The cubic root of 21834818 is about 279.5008880512.

The spelling of 21834818 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred eighteen".