21855354 has 8 divisors (see below), whose sum is σ = 43710720. Its totient is φ = 7285116.

The previous prime is 21855349. The next prime is 21855367. The reversal of 21855354 is 45355812.

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

21855354 is an admirable number.

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, 1821274 + ... + 1821285.

It is an arithmetic number, because the mean of its divisors is an integer number (5463840).

Almost surely, 2^21855354 is an apocalyptic number.

21855354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21855354 is a wasteful number, since it uses less digits than its factorization.

21855354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642564.

The product of its digits is 24000, while the sum is 33.

The square root of 21855354 is about 4674.9710159529. The cubic root of 21855354 is about 279.5884856321.

The spelling of 21855354 in words is "twenty-one million, eight hundred fifty-five thousand, three hundred fifty-four".