1211123142 has 12 divisors (see below), whose sum is σ = 2624100180. Its totient is φ = 403707708.

The previous prime is 1211123077. The next prime is 1211123189. The reversal of 1211123142 is 2413211121.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67284619 = 1211123142 / (1 + 2 + 1 + 1 + 1 + 2 + 3 + 1 + 4 + 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33642292 + ... + 33642327.

It is an arithmetic number, because the mean of its divisors is an integer number (218675015).

Almost surely, 2^1211123142 is an apocalyptic number.

1211123142 is an abundant number, since it is smaller than the sum of its proper divisors (1412977038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211123142 is a wasteful number, since it uses less digits than its factorization.

1211123142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67284627 (or 67284624 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1211123142 is about 34801.1945484634. The cubic root of 1211123142 is about 1065.9318380103.

Adding to 1211123142 its reverse (2413211121), we get a palindrome (3624334263).

It can be divided in two parts, 12111 and 23142, that added together give a palindrome (35253).

The spelling of 1211123142 in words is "one billion, two hundred eleven million, one hundred twenty-three thousand, one hundred forty-two".