1121204311 has 4 divisors (see below), whose sum is σ = 1157372224. Its totient is φ = 1085036400.

The previous prime is 1121204309. The next prime is 1121204389. The reversal of 1121204311 is 1134021211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1134021211 = 631 ⋅1797181.

It is a cyclic number.

It is not a de Polignac number, because 1121204311 - 2¹ = 1121204309 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 (1121204011) 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, 18083910 + ... + 18083971.

It is an arithmetic number, because the mean of its divisors is an integer number (289343056).

Almost surely, 2^1121204311 is an apocalyptic number.

1121204311 is a deficient number, since it is larger than the sum of its proper divisors (36167913).

1121204311 is an equidigital number, since it uses as much as digits as its factorization.

1121204311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36167912.

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

The square root of 1121204311 is about 33484.3890641594. The cubic root of 1121204311 is about 1038.8709119018.

Adding to 1121204311 its reverse (1134021211), we get a palindrome (2255225522).

The spelling of 1121204311 in words is "one billion, one hundred twenty-one million, two hundred four thousand, three hundred eleven".