21545250540200 has 96 divisors (see below), whose sum is σ = 52036865856000. Its totient is φ = 8286108230400.

The previous prime is 21545250540181. The next prime is 21545250540323. The reversal of 21545250540200 is 204505254512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6385136 + ... + 9157535.

It is an arithmetic number, because the mean of its divisors is an integer number (542050686000).

Almost surely, 2^{21545250540200} is an apocalyptic number.

21545250540200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21545250540200 is an abundant number, since it is smaller than the sum of its proper divisors (30491615315800).

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

21545250540200 is a wasteful number, since it uses less digits than its factorization.

21545250540200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15542955 (or 15542946 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 35.

Adding to 21545250540200 its reverse (204505254512), we get a palindrome (21749755794712).

The spelling of 21545250540200 in words is "twenty-one trillion, five hundred forty-five billion, two hundred fifty million, five hundred forty thousand, two hundred".