21552032064 has 112 divisors (see below), whose sum is σ = 61781911488. Its totient is φ = 6604136448.

The previous prime is 21552032053. The next prime is 21552032119. The reversal of 21552032064 is 46023025512.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 63574 + ... + 217130.

Almost surely, 2^21552032064 is an apocalyptic number.

21552032064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21552032064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30890955744).

21552032064 is an abundant number, since it is smaller than the sum of its proper divisors (40229879424).

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

21552032064 is a wasteful number, since it uses less digits than its factorization.

21552032064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153632 (or 153622 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21552032064 its reverse (46023025512), we get a palindrome (67575057576).

The spelling of 21552032064 in words is "twenty-one billion, five hundred fifty-two million, thirty-two thousand, sixty-four".