11111022121123 has 4 divisors (see below), whose sum is σ = 11111417601480. Its totient is φ = 11110626640768.

The previous prime is 11111022121093. The next prime is 11111022121127. The reversal of 11111022121123 is 32112122011111.

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 11111022121123 - 2⁵ = 11111022121091 is a prime.

It is a super-2 number, since 2×11111022121123² (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 11111022121123.

It is not an unprimeable number, because it can be changed into a prime (11111022121127) 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, 197698033 + ... + 197754226.

It is an arithmetic number, because the mean of its divisors is an integer number (2777854400370).

Almost surely, 2^{11111022121123} is an apocalyptic number.

11111022121123 is a deficient number, since it is larger than the sum of its proper divisors (395480357).

11111022121123 is an equidigital number, since it uses as much as digits as its factorization.

11111022121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395480356.

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

Adding to 11111022121123 its reverse (32112122011111), we get a palindrome (43223144132234).

The spelling of 11111022121123 in words is "eleven trillion, one hundred eleven billion, twenty-two million, one hundred twenty-one thousand, one hundred twenty-three".