11110021121 has 4 divisors (see below), whose sum is σ = 11113234644. Its totient is φ = 11106807600.

The previous prime is 11110021099. The next prime is 11110021127. The reversal of 11110021121 is 12112001111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12112001111 = 7 ⋅1730285873.

It can be written as a sum of positive squares in 2 ways, for example, as 833130496 + 10276890625 = 28864^2 + 101375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11110021121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11110021127) 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, 1601570 + ... + 1608491.

It is an arithmetic number, because the mean of its divisors is an integer number (2778308661).

Almost surely, 2^11110021121 is an apocalyptic number.

It is an amenable number.

11110021121 is a deficient number, since it is larger than the sum of its proper divisors (3213523).

11110021121 is an equidigital number, since it uses as much as digits as its factorization.

11110021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213522.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11110021121 its reverse (12112001111), we get a palindrome (23222022232).

The spelling of 11110021121 in words is "eleven billion, one hundred ten million, twenty-one thousand, one hundred twenty-one".