1121203311 has 16 divisors (see below), whose sum is σ = 1503659520. Its totient is φ = 743122080.

The previous prime is 1121203301. The next prime is 1121203361. The reversal of 1121203311 is 1133021211.

It is a happy number.

It is not a de Polignac number, because 1121203311 - 2¹⁸ = 1120941167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121203301) 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, 400326 + ... + 403116.

It is an arithmetic number, because the mean of its divisors is an integer number (93978720).

Almost surely, 2^1121203311 is an apocalyptic number.

1121203311 is a deficient number, since it is larger than the sum of its proper divisors (382456209).

1121203311 is a wasteful number, since it uses less digits than its factorization.

1121203311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1121203311 is about 33484.3741318245. The cubic root of 1121203311 is about 1038.8706030460.

Adding to 1121203311 its reverse (1133021211), we get a palindrome (2254224522).

The spelling of 1121203311 in words is "one billion, one hundred twenty-one million, two hundred three thousand, three hundred eleven".