21053584 has 10 divisors (see below), whose sum is σ = 40791350. Its totient is φ = 10526784.

The previous prime is 21053567. The next prime is 21053597. The reversal of 21053584 is 48535012.

It can be written as a sum of positive squares in only one way, i.e., 12759184 + 8294400 = 3572^2 + 2880^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657909 + ... + 657940.

It is an arithmetic number, because the mean of its divisors is an integer number (4079135).

Almost surely, 2^21053584 is an apocalyptic number.

It is an amenable number.

21053584 is a deficient number, since it is larger than the sum of its proper divisors (19737766).

21053584 is a wasteful number, since it uses less digits than its factorization.

21053584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315857 (or 1315851 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 21053584 is about 4588.4184639154. The cubic root of 21053584 is about 276.1268757844.

Adding to 21053584 its reverse (48535012), we get a palindrome (69588596).

The spelling of 21053584 in words is "twenty-one million, fifty-three thousand, five hundred eighty-four".