11111222021020 has 48 divisors (see below), whose sum is σ = 25456742333568. Its totient is φ = 4040135991360.

The previous prime is 11111222020993. The next prime is 11111222021021. The reversal of 11111222021020 is 2012022211111.

It is a junction number, because it is equal to n+sod(n) for n = 11111222020985 and 11111222021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111222021021) 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, 971539 + ... + 4813141.

It is an arithmetic number, because the mean of its divisors is an integer number (530348798616).

Almost surely, 2^{11111222021020} is an apocalyptic number.

11111222021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111222021020 is an abundant number, since it is smaller than the sum of its proper divisors (14345520312548).

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

11111222021020 is a wasteful number, since it uses less digits than its factorization.

11111222021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3854770 (or 3854768 counting only the distinct ones).

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

Adding to 11111222021020 its reverse (2012022211111), we get a palindrome (13123244232131).

The spelling of 11111222021020 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, twenty-one thousand, twenty".