21053152 has 12 divisors (see below), whose sum is σ = 41448456. Its totient is φ = 10526560.

The previous prime is 21053129. The next prime is 21053173. The reversal of 21053152 is 25135012.

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, 328924 + ... + 328987.

It is an arithmetic number, because the mean of its divisors is an integer number (3454038).

Almost surely, 2^21053152 is an apocalyptic number.

It is an amenable number.

21053152 is a deficient number, since it is larger than the sum of its proper divisors (20395304).

21053152 is an equidigital number, since it uses as much as digits as its factorization.

21053152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657921 (or 657913 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21053152 is about 4588.3713886302. The cubic root of 21053152 is about 276.1249871491.

Adding to 21053152 its reverse (25135012), we get a palindrome (46188164).

The spelling of 21053152 in words is "twenty-one million, fifty-three thousand, one hundred fifty-two".