21552691200 has 144 divisors (see below), whose sum is σ = 71250674040. Its totient is φ = 5747343360.

The previous prime is 21552691169. The next prime is 21552691217. The reversal of 21552691200 is 219625512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83442 + ... + 223758.

Almost surely, 2^21552691200 is an apocalyptic number.

21552691200 is a gapful number since it is divisible by the number (20) 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 21552691200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35625337020).

21552691200 is an abundant number, since it is smaller than the sum of its proper divisors (49697982840).

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

21552691200 is a wasteful number, since it uses less digits than its factorization.

21552691200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140352 (or 140327 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 21552691200 in words is "twenty-one billion, five hundred fifty-two million, six hundred ninety-one thousand, two hundred".