21550243203000 has 384 divisors, whose sum is σ = 74290988566080. Its totient is φ = 5633208115200.

The previous prime is 21550243202993. The next prime is 21550243203017. The reversal of 21550243203000 is 30234205512.

It is a happy number.

21550243203000 is a `hidden beast` number, since 2 + 15 + 5 + 0 + 24 + 320 + 300 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 106990384 + ... + 107191616.

Almost surely, 2^{21550243203000} is an apocalyptic number.

21550243203000 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 21550243203000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37145494283040).

21550243203000 is an abundant number, since it is smaller than the sum of its proper divisors (52740745363080).

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

21550243203000 is a wasteful number, since it uses less digits than its factorization.

21550243203000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201496 (or 201479 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21550243203000 its reverse (30234205512), we get a palindrome (21580477408512).

The spelling of 21550243203000 in words is "twenty-one trillion, five hundred fifty billion, two hundred forty-three million, two hundred three thousand".