21559152 has 20 divisors (see below), whose sum is σ = 55694600. Its totient is φ = 7186368.

The previous prime is 21559141. The next prime is 21559159. The reversal of 21559152 is 25195512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21559159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224527 + ... + 224622.

It is an arithmetic number, because the mean of its divisors is an integer number (2784730).

Almost surely, 2^21559152 is an apocalyptic number.

It is an amenable number.

21559152 is an abundant number, since it is smaller than the sum of its proper divisors (34135448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21559152 is a wasteful number, since it uses less digits than its factorization.

21559152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449160 (or 449154 counting only the distinct ones).

The product of its digits is 4500, while the sum is 30.

The square root of 21559152 is about 4643.1833907353. The cubic root of 21559152 is about 278.3196640312.

The spelling of 21559152 in words is "twenty-one million, five hundred fifty-nine thousand, one hundred fifty-two".