12111121020 has 24 divisors (see below), whose sum is σ = 33911139024. Its totient is φ = 3229632256.

The previous prime is 12111121007. The next prime is 12111121021. The reversal of 12111121020 is 2012111121.

It is a super-2 number, since 2×12111121020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12111120987 and 12111121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111121021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100925949 + ... + 100926068.

It is an arithmetic number, because the mean of its divisors is an integer number (1412964126).

Almost surely, 2^12111121020 is an apocalyptic number.

12111121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111121020 is an abundant number, since it is smaller than the sum of its proper divisors (21800018004).

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

12111121020 is a wasteful number, since it uses less digits than its factorization.

12111121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201852029 (or 201852027 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12111121020 its reverse (2012111121), we get a palindrome (14123232141).

The spelling of 12111121020 in words is "twelve billion, one hundred eleven million, one hundred twenty-one thousand, twenty".