121013220 has 48 divisors (see below), whose sum is σ = 341526528. Its totient is φ = 32014080.

The previous prime is 121013219. The next prime is 121013231. The reversal of 121013220 is 22310121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121013196 and 121013205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321 + ... + 15560.

It is an arithmetic number, because the mean of its divisors is an integer number (7115136).

Almost surely, 2^121013220 is an apocalyptic number.

121013220 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 121013220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170763264).

121013220 is an abundant number, since it is smaller than the sum of its proper divisors (220513308).

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

121013220 is a wasteful number, since it uses less digits than its factorization.

121013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16020 (or 16018 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 121013220 is about 11000.6008926785. The cubic root of 121013220 is about 494.6267566926.

Adding to 121013220 its reverse (22310121), we get a palindrome (143323341).

The spelling of 121013220 in words is "one hundred twenty-one million, thirteen thousand, two hundred twenty".