121111221002020 has 288 divisors, whose sum is σ = 274146655216896. Its totient is φ = 44929213056000.

The previous prime is 121111221001997. The next prime is 121111221002033. The reversal of 121111221002020 is 20200122111121.

It is a junction number, because it is equal to n+sod(n) for n = 121111221001985 and 121111221002003.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 27989649097 + ... + 27989653423.

It is an arithmetic number, because the mean of its divisors is an integer number (951898108392).

Almost surely, 2^{121111221002020} is an apocalyptic number.

121111221002020 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 121111221002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137073327608448).

121111221002020 is an abundant number, since it is smaller than the sum of its proper divisors (153035434214876).

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

121111221002020 is a wasteful number, since it uses less digits than its factorization.

121111221002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899 (or 4878 counting only the distinct ones).

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

Adding to 121111221002020 its reverse (20200122111121), we get a palindrome (141311343113141).

The spelling of 121111221002020 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two thousand, twenty".