21045154 has 16 divisors (see below), whose sum is σ = 34107192. Its totient is φ = 9681408.

The previous prime is 21045151. The next prime is 21045197. The reversal of 21045154 is 45154012.

It can be written as a sum of positive squares in 4 ways, for example, as 11404129 + 9641025 = 3377^2 + 3105^2 .

It is not an unprimeable number, because it can be changed into a prime (21045151) 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 7 ways as a sum of consecutive naturals, for example, 8032 + ... + 10324.

Almost surely, 2^21045154 is an apocalyptic number.

21045154 is a deficient number, since it is larger than the sum of its proper divisors (13062038).

21045154 is a wasteful number, since it uses less digits than its factorization.

21045154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21045154 is about 4587.4997547684. The cubic root of 21045154 is about 276.0900164969.

Adding to 21045154 its reverse (45154012), we get a palindrome (66199166).

The spelling of 21045154 in words is "twenty-one million, forty-five thousand, one hundred fifty-four".