21550320325143 has 24 divisors (see below), whose sum is σ = 32992842980448. Its totient is φ = 13508013906432.

The previous prime is 21550320325111. The next prime is 21550320325189. The reversal of 21550320325143 is 34152302305512.

21550320325143 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 0 + 320 + 325 + 1 + 4 + 3 = 666.

It is not a de Polignac number, because 21550320325143 - 2⁵ = 21550320325111 is a prime.

It is a super-2 number, since 2×21550320325143² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21550320325098 and 21550320325107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550320315143) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 71493430 + ... + 71794227.

It is an arithmetic number, because the mean of its divisors is an integer number (1374701790852).

Almost surely, 2^{21550320325143} is an apocalyptic number.

21550320325143 is a deficient number, since it is larger than the sum of its proper divisors (11442522655305).

21550320325143 is a wasteful number, since it uses less digits than its factorization.

21550320325143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143288663 (or 143288660 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 21550320325143 in words is "twenty-one trillion, five hundred fifty billion, three hundred twenty million, three hundred twenty-five thousand, one hundred forty-three".