12111021221020 has 12 divisors (see below), whose sum is σ = 25433144564184. Its totient is φ = 4844408488400.

The previous prime is 12111021221009. The next prime is 12111021221053. The reversal of 12111021221020 is 2012212011121.

It is a junction number, because it is equal to n+sod(n) for n = 12111021220985 and 12111021221003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302775530506 + ... + 302775530545.

It is an arithmetic number, because the mean of its divisors is an integer number (2119428713682).

Almost surely, 2^{12111021221020} is an apocalyptic number.

12111021221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111021221020 is an abundant number, since it is smaller than the sum of its proper divisors (13322123343164).

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

12111021221020 is a wasteful number, since it uses less digits than its factorization.

12111021221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605551061060 (or 605551061058 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12111021221020 its reverse (2012212011121), we get a palindrome (14123233232141).

The spelling of 12111021221020 in words is "twelve trillion, one hundred eleven billion, twenty-one million, two hundred twenty-one thousand, twenty".