121011433220 has 96 divisors (see below), whose sum is σ = 265772967936. Its totient is φ = 46230912000.

The previous prime is 121011433187. The next prime is 121011433271. The reversal of 121011433220 is 22334110121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121011433192 and 121011433201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14694224 + ... + 14702456.

It is an arithmetic number, because the mean of its divisors is an integer number (2768468416).

Almost surely, 2^121011433220 is an apocalyptic number.

121011433220 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 121011433220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132886483968).

121011433220 is an abundant number, since it is smaller than the sum of its proper divisors (144761534716).

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

121011433220 is a wasteful number, since it uses less digits than its factorization.

121011433220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8581 (or 8579 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 121011433220 its reverse (22334110121), we get a palindrome (143345543341).

The spelling of 121011433220 in words is "one hundred twenty-one billion, eleven million, four hundred thirty-three thousand, two hundred twenty".