11111010120121 has 6 divisors (see below), whose sum is σ = 11615101317050. Its totient is φ = 10627922723088.

The previous prime is 11111010120103. The next prime is 11111010120211. The reversal of 11111010120121 is 12102101011111.

It can be written as a sum of positive squares in only one way, i.e., 10921405610025 + 189604510096 = 3304755^2 + 435436^2 .

It is not a de Polignac number, because 11111010120121 - 2¹⁷ = 11111009989049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111010121121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10501899396 + ... + 10501900453.

Almost surely, 2^{11111010120121} is an apocalyptic number.

It is an amenable number.

11111010120121 is a deficient number, since it is larger than the sum of its proper divisors (504091196929).

11111010120121 is an equidigital number, since it uses as much as digits as its factorization.

11111010120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21003799895 (or 21003799872 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11111010120121 its reverse (12102101011111), we get a palindrome (23213111131232).

The spelling of 11111010120121 in words is "eleven trillion, one hundred eleven billion, ten million, one hundred twenty thousand, one hundred twenty-one".