221131143 has 6 divisors (see below), whose sum is σ = 319411664. Its totient is φ = 147420756.

The previous prime is 221131111. The next prime is 221131147. The reversal of 221131143 is 341131122.

221131143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221131143 - 2⁵ = 221131111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12285055 + ... + 12285072.

Almost surely, 2^221131143 is an apocalyptic number.

221131143 is a deficient number, since it is larger than the sum of its proper divisors (98280521).

221131143 is a wasteful number, since it uses less digits than its factorization.

221131143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24570133 (or 24570130 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 221131143 is about 14870.4789095711. The cubic root of 221131143 is about 604.7139261772.

Adding to 221131143 its reverse (341131122), we get a palindrome (562262265).

The spelling of 221131143 in words is "two hundred twenty-one million, one hundred thirty-one thousand, one hundred forty-three".