121112221020 has 288 divisors, whose sum is σ = 413451537408. Its totient is φ = 26362119168.

The previous prime is 121112221019. The next prime is 121112221063. The reversal of 121112221020 is 20122211121.

121112221020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 15751617 + ... + 15759303.

It is an arithmetic number, because the mean of its divisors is an integer number (1435595616).

Almost surely, 2^121112221020 is an apocalyptic number.

121112221020 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 121112221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206725768704).

121112221020 is an abundant number, since it is smaller than the sum of its proper divisors (292339316388).

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

121112221020 is a wasteful number, since it uses less digits than its factorization.

121112221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7969 (or 7960 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121112221020 its reverse (20122211121), we get a palindrome (141234432141).

The spelling of 121112221020 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, twenty".