21552064 has 28 divisors (see below), whose sum is σ = 42976800. Its totient is φ = 10723328.

The previous prime is 21552059. The next prime is 21552067. The reversal of 21552064 is 46025512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552067) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 14592 + ... + 16000.

Almost surely, 2^21552064 is an apocalyptic number.

It is an amenable number.

21552064 is a deficient number, since it is larger than the sum of its proper divisors (21424736).

21552064 is a wasteful number, since it uses less digits than its factorization.

21552064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 21552064 is about 4642.4200585471. The cubic root of 21552064 is about 278.2891596464.

Adding to 21552064 its reverse (46025512), we get a palindrome (67577576).

The spelling of 21552064 in words is "twenty-one million, five hundred fifty-two thousand, sixty-four".