21445532000 has 192 divisors, whose sum is σ = 53811838080. Its totient is φ = 8398080000.

The previous prime is 21445531999. The next prime is 21445532021. The reversal of 21445532000 is 23554412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44035757 + ... + 44036243.

It is an arithmetic number, because the mean of its divisors is an integer number (280269990).

Almost surely, 2^21445532000 is an apocalyptic number.

21445532000 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 21445532000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26905919040).

21445532000 is an abundant number, since it is smaller than the sum of its proper divisors (32366306080).

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

21445532000 is a wasteful number, since it uses less digits than its factorization.

21445532000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 21445532000 in words is "twenty-one billion, four hundred forty-five million, five hundred thirty-two thousand".