1121320121 has 4 divisors (see below), whose sum is σ = 1121414544. Its totient is φ = 1121225700.

The previous prime is 1121320091. The next prime is 1121320129. The reversal of 1121320121 is 1210231211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1210231211 = 7 ⋅172890173.

It is a cyclic number.

It is not a de Polignac number, because 1121320121 - 2¹⁰ = 1121319097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121320096 and 1121320105.

It is not an unprimeable number, because it can be changed into a prime (1121320129) 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, 26315 + ... + 54176.

It is an arithmetic number, because the mean of its divisors is an integer number (280353636).

Almost surely, 2^1121320121 is an apocalyptic number.

It is an amenable number.

1121320121 is a deficient number, since it is larger than the sum of its proper divisors (94423).

1121320121 is an equidigital number, since it uses as much as digits as its factorization.

1121320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94422.

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

The square root of 1121320121 is about 33486.1183328256. The cubic root of 1121320121 is about 1038.9066792450.

Adding to 1121320121 its reverse (1210231211), we get a palindrome (2331551332).

The spelling of 1121320121 in words is "one billion, one hundred twenty-one million, three hundred twenty thousand, one hundred twenty-one".