11112111110021 has 4 divisors (see below), whose sum is σ = 11696959063200. Its totient is φ = 10527263156844.

The previous prime is 11112111110003. The next prime is 11112111110117. The reversal of 11112111110021 is 12001111121111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11112111110021 - 2¹⁴ = 11112111093637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11112111109978 and 11112111110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112111100021) 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, 292423976561 + ... + 292423976598.

It is an arithmetic number, because the mean of its divisors is an integer number (2924239765800).

Almost surely, 2^{11112111110021} is an apocalyptic number.

It is an amenable number.

11112111110021 is a deficient number, since it is larger than the sum of its proper divisors (584847953179).

11112111110021 is an equidigital number, since it uses as much as digits as its factorization.

11112111110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584847953178.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 11112111110021 its reverse (12001111121111), we get a palindrome (23113222231132).

The spelling of 11112111110021 in words is "eleven trillion, one hundred twelve billion, one hundred eleven million, one hundred ten thousand, twenty-one".