11111040121 has 4 divisors (see below), whose sum is σ = 11123710372. Its totient is φ = 11098369872.

The previous prime is 11111040113. The next prime is 11111040131. The reversal of 11111040121 is 12104011111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9108030096 + 2003010025 = 95436^2 + 44755^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111040121 - 2³ = 11111040113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111040131) 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, 6333810 + ... + 6335563.

It is an arithmetic number, because the mean of its divisors is an integer number (2780927593).

Almost surely, 2^11111040121 is an apocalyptic number.

It is an amenable number.

11111040121 is a deficient number, since it is larger than the sum of its proper divisors (12670251).

11111040121 is an equidigital number, since it uses as much as digits as its factorization.

11111040121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12670250.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11111040121 its reverse (12104011111), we get a palindrome (23215051232).

The spelling of 11111040121 in words is "eleven billion, one hundred eleven million, forty thousand, one hundred twenty-one".