21148084 has 6 divisors (see below), whose sum is σ = 37009154. Its totient is φ = 10574040.

The previous prime is 21148079. The next prime is 21148123. The reversal of 21148084 is 48084112.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 10112400 = 3322^2 + 3180^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2643507 + ... + 2643514.

Almost surely, 2^21148084 is an apocalyptic number.

It is an amenable number.

21148084 is a deficient number, since it is larger than the sum of its proper divisors (15861070).

21148084 is a wasteful number, since it uses less digits than its factorization.

21148084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287025 (or 5287023 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21148084 is about 4598.7046002108. The cubic root of 21148084 is about 276.5393953418.

The spelling of 21148084 in words is "twenty-one million, one hundred forty-eight thousand, eighty-four".