21506532243000 has 256 divisors, whose sum is σ = 77004367165440. Its totient is φ = 4895380224000.

The previous prime is 21506532242969. The next prime is 21506532243011. The reversal of 21506532243000 is 34223560512.

It is a happy number.

It is a super-2 number, since 2×21506532243000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2936269 + ... + 7185731.

It is an arithmetic number, because the mean of its divisors is an integer number (300798309240).

Almost surely, 2^{21506532243000} is an apocalyptic number.

21506532243000 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 21506532243000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38502183582720).

21506532243000 is an abundant number, since it is smaller than the sum of its proper divisors (55497834922440).

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

21506532243000 is a wasteful number, since it uses less digits than its factorization.

21506532243000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249735 (or 4249721 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 21506532243000 in words is "twenty-one trillion, five hundred six billion, five hundred thirty-two million, two hundred forty-three thousand".