11112121121021 has 16 divisors (see below), whose sum is σ = 11185123844160. Its totient is φ = 11039345051520.

The previous prime is 11112121121009. The next prime is 11112121121053. The reversal of 11112121121021 is 12012112121111.

11112121121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11112121121021 - 2¹⁸ = 11112120858877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112121121071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354020090 + ... + 354051476.

It is an arithmetic number, because the mean of its divisors is an integer number (699070240260).

Almost surely, 2^{11112121121021} is an apocalyptic number.

It is an amenable number.

11112121121021 is a deficient number, since it is larger than the sum of its proper divisors (73002723139).

11112121121021 is a wasteful number, since it uses less digits than its factorization.

11112121121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34924.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11112121121021 its reverse (12012112121111), we get a palindrome (23124233242132).

The spelling of 11112121121021 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty-one".