143505221131 has 4 divisors (see below), whose sum is σ = 145471046152. Its totient is φ = 141539396112.

The previous prime is 143505221113. The next prime is 143505221147. The reversal of 143505221131 is 131122505341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131122505341 = 19403 ⋅6757847.

It is a cyclic number.

It is not a de Polignac number, because 143505221131 - 2¹⁵ = 143505188363 is a prime.

It is a super-2 number, since 2×143505221131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 143505221131.

It is not an unprimeable number, because it can be changed into a prime (143505221231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982912401 + ... + 982912546.

It is an arithmetic number, because the mean of its divisors is an integer number (36367761538).

Almost surely, 2^143505221131 is an apocalyptic number.

143505221131 is a deficient number, since it is larger than the sum of its proper divisors (1965825021).

143505221131 is an equidigital number, since it uses as much as digits as its factorization.

143505221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965825020.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 143505221131 its reverse (131122505341), we get a palindrome (274627726472).

The spelling of 143505221131 in words is "one hundred forty-three billion, five hundred five million, two hundred twenty-one thousand, one hundred thirty-one".