1143211111 has 16 divisors (see below), whose sum is σ = 1346176000. Its totient is φ = 970351704.

The previous prime is 1143211109. The next prime is 1143211123. The reversal of 1143211111 is 1111123411.

It is not a de Polignac number, because 1143211111 - 2¹ = 1143211109 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 (1143211411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19150 + ... + 51508.

It is an arithmetic number, because the mean of its divisors is an integer number (84136000).

Almost surely, 2^1143211111 is an apocalyptic number.

1143211111 is a deficient number, since it is larger than the sum of its proper divisors (202964889).

1143211111 is an equidigital number, since it uses as much as digits as its factorization.

1143211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32483 (or 32469 counting only the distinct ones).

The product of its digits is 24, while the sum is 16.

The square root of 1143211111 is about 33811.4050432691. The cubic root of 1143211111 is about 1045.6238458114.

Adding to 1143211111 its reverse (1111123411), we get a palindrome (2254334522).

The spelling of 1143211111 in words is "one billion, one hundred forty-three million, two hundred eleven thousand, one hundred eleven".