21328154 has 8 divisors (see below), whose sum is σ = 32596020. Its totient is φ = 10462816.

The previous prime is 21328117. The next prime is 21328157. The reversal of 21328154 is 45182312.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 29929 = 4615^2 + 173^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21328157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100499 + ... + 100710.

Almost surely, 2^21328154 is an apocalyptic number.

21328154 is a deficient number, since it is larger than the sum of its proper divisors (11267866).

21328154 is a wasteful number, since it uses less digits than its factorization.

21328154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201264.

The product of its digits is 1920, while the sum is 26.

The square root of 21328154 is about 4618.2414402021. The cubic root of 21328154 is about 277.3220632414.

The spelling of 21328154 in words is "twenty-one million, three hundred twenty-eight thousand, one hundred fifty-four".