21154048 has 18 divisors (see below), whose sum is σ = 42225974. Its totient is φ = 10576896.

The previous prime is 21154039. The next prime is 21154097. The reversal of 21154048 is 84045112.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 2214144 = 4352^2 + 1488^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41061 + ... + 41572.

Almost surely, 2^21154048 is an apocalyptic number.

It is an amenable number.

21154048 is a deficient number, since it is larger than the sum of its proper divisors (21071926).

21154048 is an frugal number, since it uses more digits than its factorization.

21154048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82649 (or 82635 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21154048 is about 4599.3529979770. The cubic root of 21154048 is about 276.5653886491.

The spelling of 21154048 in words is "twenty-one million, one hundred fifty-four thousand, forty-eight".