1121212031 has 4 divisors (see below), whose sum is σ = 1121279952. Its totient is φ = 1121144112.

The previous prime is 1121212013. The next prime is 1121212063. The reversal of 1121212031 is 1302121211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1302121211 = 167 ⋅7797133.

It is a cyclic number.

It is not a de Polignac number, because 1121212031 - 2⁶ = 1121211967 is a prime.

It is a super-2 number, since 2×1121212031² = 2514232836918289922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121211997 and 1121212015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123212031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8486 + ... + 48108.

It is an arithmetic number, because the mean of its divisors is an integer number (280319988).

Almost surely, 2^1121212031 is an apocalyptic number.

1121212031 is a deficient number, since it is larger than the sum of its proper divisors (67921).

1121212031 is an equidigital number, since it uses as much as digits as its factorization.

1121212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67920.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1121212031 is about 33484.5043415607. The cubic root of 1121212031 is about 1038.8732962620.

Adding to 1121212031 its reverse (1302121211), we get a palindrome (2423333242).

The spelling of 1121212031 in words is "one billion, one hundred twenty-one million, two hundred twelve thousand, thirty-one".