21255152 has 10 divisors (see below), whose sum is σ = 41181888. Its totient is φ = 10627568.

The previous prime is 21255133. The next prime is 21255161. The reversal of 21255152 is 25155212.

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, 664208 + ... + 664239.

Almost surely, 2^21255152 is an apocalyptic number.

It is an amenable number.

21255152 is a deficient number, since it is larger than the sum of its proper divisors (19926736).

21255152 is a wasteful number, since it uses less digits than its factorization.

21255152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328455 (or 1328449 counting only the distinct ones).

The product of its digits is 1000, while the sum is 23.

The square root of 21255152 is about 4610.3310076393. The cubic root of 21255152 is about 277.0052955931.

The spelling of 21255152 in words is "twenty-one million, two hundred fifty-five thousand, one hundred fifty-two".