21855334 has 8 divisors (see below), whose sum is σ = 32826528. Its totient is φ = 10913160.

The previous prime is 21855331. The next prime is 21855343. The reversal of 21855334 is 43355812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21855296 and 21855305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21855331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5262 + ... + 8449.

It is an arithmetic number, because the mean of its divisors is an integer number (4103316).

Almost surely, 2^21855334 is an apocalyptic number.

21855334 is a deficient number, since it is larger than the sum of its proper divisors (10971194).

21855334 is a wasteful number, since it uses less digits than its factorization.

21855334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14510.

The product of its digits is 14400, while the sum is 31.

The square root of 21855334 is about 4674.9688769017. The cubic root of 21855334 is about 279.5884003475.

The spelling of 21855334 in words is "twenty-one million, eight hundred fifty-five thousand, three hundred thirty-four".