221561561143 has 16 divisors (see below), whose sum is σ = 256506808320. Its totient is φ = 189631799136.

The previous prime is 221561561141. The next prime is 221561561159. The reversal of 221561561143 is 341165165122.

It is not a de Polignac number, because 221561561143 - 2¹ = 221561561141 is a prime.

It is a super-2 number, since 2×221561561143² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221561561141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9531055 + ... + 9554272.

It is an arithmetic number, because the mean of its divisors is an integer number (16031675520).

Almost surely, 2^221561561143 is an apocalyptic number.

221561561143 is a deficient number, since it is larger than the sum of its proper divisors (34945247177).

221561561143 is a wasteful number, since it uses less digits than its factorization.

221561561143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085406.

The product of its digits is 43200, while the sum is 37.

The spelling of 221561561143 in words is "two hundred twenty-one billion, five hundred sixty-one million, five hundred sixty-one thousand, one hundred forty-three".