111201221221020 has 576 divisors, whose sum is σ = 406199958528000. Its totient is φ = 24588667514880.

The previous prime is 111201221220977. The next prime is 111201221221067. The reversal of 111201221221020 is 20122122102111.

111201221221020 is a `hidden beast` number, since 1 + 1 + 1 + 201 + 221 + 221 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111201221220984 and 111201221221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6329390796 + ... + 6329408364.

Almost surely, 2^{111201221221020} is an apocalyptic number.

111201221221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111201221221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203099979264000).

111201221221020 is an abundant number, since it is smaller than the sum of its proper divisors (294998737306980).

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

111201221221020 is a wasteful number, since it uses less digits than its factorization.

111201221221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20943 (or 20924 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111201221221020 its reverse (20122122102111), we get a palindrome (131323343323131).

The spelling of 111201221221020 in words is "one hundred eleven trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty".