21063321323550 has 144 divisors (see below), whose sum is σ = 63863462454480. Its totient is φ = 4930181760000.

The previous prime is 21063321323543. The next prime is 21063321323581. The reversal of 21063321323550 is 5532312336012.

21063321323550 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 3 + 321 + 323 + 5 + 5 + 0 = 666.

It is a super-2 number, since 2×21063321323550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 73222251 + ... + 73509350.

It is an arithmetic number, because the mean of its divisors is an integer number (443496267045).

Almost surely, 2^{21063321323550} is an apocalyptic number.

21063321323550 is an abundant number, since it is smaller than the sum of its proper divisors (42800141130930).

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

21063321323550 is a wasteful number, since it uses less digits than its factorization.

21063321323550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146731659 (or 146731651 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

Adding to 21063321323550 its reverse (5532312336012), we get a palindrome (26595633659562).

The spelling of 21063321323550 in words is "twenty-one trillion, sixty-three billion, three hundred twenty-one million, three hundred twenty-three thousand, five hundred fifty".