21552602144 has 12 divisors (see below), whose sum is σ = 42431685534. Its totient is φ = 10776301056.

The previous prime is 21552602089. The next prime is 21552602147. The reversal of 21552602144 is 44120625512.

It can be written as a sum of positive squares in only one way, i.e., 20489059600 + 1063542544 = 143140^2 + 32612^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 673518817 = 21552602144 / (2 + 1 + 5 + 5 + 2 + 6 + 0 + 2 + 1 + 4 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 21552602144.

It is not an unprimeable number, because it can be changed into a prime (21552602147) 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 as a sum of consecutive naturals, namely, 336759377 + ... + 336759440.

Almost surely, 2^21552602144 is an apocalyptic number.

It is an amenable number.

21552602144 is a deficient number, since it is larger than the sum of its proper divisors (20879083390).

21552602144 is an equidigital number, since it uses as much as digits as its factorization.

21552602144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673518827 (or 673518819 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 21552602144 in words is "twenty-one billion, five hundred fifty-two million, six hundred two thousand, one hundred forty-four".