121002221020 has 72 divisors (see below), whose sum is σ = 269124629760. Its totient is φ = 45644699520.

The previous prime is 121002220979. The next prime is 121002221051. The reversal of 121002221020 is 20122200121.

It is a happy number.

121002221020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1016005 + ... + 1128835.

It is an arithmetic number, because the mean of its divisors is an integer number (3737842080).

Almost surely, 2^121002221020 is an apocalyptic number.

121002221020 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 121002221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134562314880).

121002221020 is an abundant number, since it is smaller than the sum of its proper divisors (148122408740).

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

121002221020 is a wasteful number, since it uses less digits than its factorization.

121002221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112955 (or 112910 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121002221020 its reverse (20122200121), we get a palindrome (141124421141).

The spelling of 121002221020 in words is "one hundred twenty-one billion, two million, two hundred twenty-one thousand, twenty".