11112121021123 has 4 divisors (see below), whose sum is σ = 11112159356568. Its totient is φ = 11112082685680.

The previous prime is 11112121021103. The next prime is 11112121021247. The reversal of 11112121021123 is 32112012121111.

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

It is a cyclic number.

It is not a de Polignac number, because 11112121021123 - 2⁵ = 11112121021091 is a prime.

It is a super-2 number, since 2×11112121021123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11112121021123.

It is not an unprimeable number, because it can be changed into a prime (11112121021103) 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, 18729586 + ... + 19313767.

It is an arithmetic number, because the mean of its divisors is an integer number (2778039839142).

Almost surely, 2^{11112121021123} is an apocalyptic number.

11112121021123 is a deficient number, since it is larger than the sum of its proper divisors (38335445).

11112121021123 is an equidigital number, since it uses as much as digits as its factorization.

11112121021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38335444.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11112121021123 its reverse (32112012121111), we get a palindrome (43224133142234).

The spelling of 11112121021123 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-three".