1211102143 has 4 divisors (see below), whose sum is σ = 1211894728. Its totient is φ = 1210309560.

The previous prime is 1211102131. The next prime is 1211102149. The reversal of 1211102143 is 3412011121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3412011121 = 487 ⋅7006183.

It is a cyclic number.

It is not a de Polignac number, because 1211102143 - 2⁹ = 1211101631 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 (1211102149) 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, 393996 + ... + 397057.

It is an arithmetic number, because the mean of its divisors is an integer number (302973682).

Almost surely, 2^1211102143 is an apocalyptic number.

1211102143 is a deficient number, since it is larger than the sum of its proper divisors (792585).

1211102143 is an equidigital number, since it uses as much as digits as its factorization.

1211102143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792584.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211102143 is about 34800.8928477417. The cubic root of 1211102143 is about 1065.9256774389.

Adding to 1211102143 its reverse (3412011121), we get a palindrome (4623113264).

The spelling of 1211102143 in words is "one billion, two hundred eleven million, one hundred two thousand, one hundred forty-three".