11111111121020 has 48 divisors (see below), whose sum is σ = 23611252140000. Its totient is φ = 4391574190080.

The previous prime is 11111111121017. The next prime is 11111111121023. The reversal of 11111111121020 is 2012111111111.

It is an interprime number because it is at equal distance from previous prime (11111111121017) and next prime (11111111121023).

It is a junction number, because it is equal to n+sod(n) for n = 11111111120986 and 11111111121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111111121023) 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, 586100 + ... + 4750340.

It is an arithmetic number, because the mean of its divisors is an integer number (491901086250).

Almost surely, 2^{11111111121020} is an apocalyptic number.

11111111121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111111121020 is an abundant number, since it is smaller than the sum of its proper divisors (12500141018980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111111121020 is a wasteful number, since it uses less digits than its factorization.

11111111121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165838 (or 4165836 counting only the distinct ones).

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

Adding to 11111111121020 its reverse (2012111111111), we get a palindrome (13123222232131).

Subtracting from 11111111121020 its reverse (2012111111111), we obtain a palindrome (9099000009909).

The spelling of 11111111121020 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, twenty".