11312320121 has 4 divisors (see below), whose sum is σ = 11322521700. Its totient is φ = 11302118544.

The previous prime is 11312320091. The next prime is 11312320157. The reversal of 11312320121 is 12102321311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12102321311 = 4517 ⋅2679283.

It can be written as a sum of positive squares in 2 ways, for example, as 1499238400 + 9813081721 = 38720^2 + 99061^2 .

It is a cyclic number.

It is not a de Polignac number, because 11312320121 - 2⁶ = 11312320057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11312320121.

It is not an unprimeable number, because it can be changed into a prime (11312320181) 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, 5099126 + ... + 5101343.

It is an arithmetic number, because the mean of its divisors is an integer number (2830630425).

Almost surely, 2^11312320121 is an apocalyptic number.

It is an amenable number.

11312320121 is a deficient number, since it is larger than the sum of its proper divisors (10201579).

11312320121 is a wasteful number, since it uses less digits than its factorization.

11312320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10201578.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11312320121 its reverse (12102321311), we get a palindrome (23414641432).

The spelling of 11312320121 in words is "eleven billion, three hundred twelve million, three hundred twenty thousand, one hundred twenty-one".