21384354 has 8 divisors (see below), whose sum is σ = 42768720. Its totient is φ = 7128116.

The previous prime is 21384353. The next prime is 21384359. The reversal of 21384354 is 45348312.

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

21384354 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21384353) 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, 1782024 + ... + 1782035.

It is an arithmetic number, because the mean of its divisors is an integer number (5346090).

Almost surely, 2^21384354 is an apocalyptic number.

21384354 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.

21384354 is a wasteful number, since it uses less digits than its factorization.

21384354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564064.

The product of its digits is 11520, while the sum is 30.

The square root of 21384354 is about 4624.3220043591. The cubic root of 21384354 is about 277.5654321802.

The spelling of 21384354 in words is "twenty-one million, three hundred eighty-four thousand, three hundred fifty-four".