121321220 has 12 divisors (see below), whose sum is σ = 254774604. Its totient is φ = 48528480.

The previous prime is 121321177. The next prime is 121321229. The reversal of 121321220 is 22123121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68293696 + 53027524 = 8264^2 + 7282^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121321195 and 121321204.

It is not an unprimeable number, because it can be changed into a prime (121321229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3033011 + ... + 3033050.

It is an arithmetic number, because the mean of its divisors is an integer number (21231217).

Almost surely, 2^121321220 is an apocalyptic number.

121321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121321220 is an abundant number, since it is smaller than the sum of its proper divisors (133453384).

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

121321220 is a wasteful number, since it uses less digits than its factorization.

121321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6066070 (or 6066068 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121321220 is about 11014.5912316345. The cubic root of 121321220 is about 495.0460386387.

Adding to 121321220 its reverse (22123121), we get a palindrome (143444341).

The spelling of 121321220 in words is "one hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty".