21604154 has 16 divisors (see below), whose sum is σ = 38072160. Its totient is φ = 9064560.

The previous prime is 21604151. The next prime is 21604169. The reversal of 21604154 is 45140612.

It is not an unprimeable number, because it can be changed into a prime (21604151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37484 + ... + 38055.

It is an arithmetic number, because the mean of its divisors is an integer number (2379510).

Almost surely, 2^21604154 is an apocalyptic number.

21604154 is a deficient number, since it is larger than the sum of its proper divisors (16468006).

21604154 is a wasteful number, since it uses less digits than its factorization.

21604154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75565.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21604154 is about 4648.0268932096. The cubic root of 21604154 is about 278.5131817984.

Adding to 21604154 its reverse (45140612), we get a palindrome (66744766).

The spelling of 21604154 in words is "twenty-one million, six hundred four thousand, one hundred fifty-four".