121003220 has 48 divisors (see below), whose sum is σ = 274664208. Its totient is φ = 44513280.

The previous prime is 121003123. The next prime is 121003231. The reversal of 121003220 is 22300121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 19114384 + 101888836 = 4372^2 + 10094^2 .

It is a congruent number.

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, 86930 + ... + 88310.

It is an arithmetic number, because the mean of its divisors is an integer number (5722171).

Almost surely, 2^121003220 is an apocalyptic number.

121003220 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 121003220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137332104).

121003220 is an abundant number, since it is smaller than the sum of its proper divisors (153660988).

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

121003220 is a wasteful number, since it uses less digits than its factorization.

121003220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 121003220 is about 11000.1463626626. The cubic root of 121003220 is about 494.6131317244.

Adding to 121003220 its reverse (22300121), we get a palindrome (143303341).

The spelling of 121003220 in words is "one hundred twenty-one million, three thousand, two hundred twenty".