21552150656 has 64 divisors (see below), whose sum is σ = 46319581080. Its totient is φ = 9950773248.

The previous prime is 21552150649. The next prime is 21552150671. The reversal of 21552150656 is 65605125512.

It can be written as a sum of positive squares in 4 ways, for example, as 21491560000 + 60590656 = 146600^2 + 7784^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21890 + ... + 208766.

Almost surely, 2^21552150656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21552150656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23159790540).

21552150656 is an abundant number, since it is smaller than the sum of its proper divisors (24767430424).

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

21552150656 is a wasteful number, since it uses less digits than its factorization.

21552150656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186961 (or 186949 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 21552150656 in words is "twenty-one billion, five hundred fifty-two million, one hundred fifty thousand, six hundred fifty-six".