121304220 has 24 divisors (see below), whose sum is σ = 339651984. Its totient is φ = 32347776.

The previous prime is 121304219. The next prime is 121304269. The reversal of 121304220 is 22403121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121304220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010809 + ... + 1010928.

It is an arithmetic number, because the mean of its divisors is an integer number (14152166).

Almost surely, 2^121304220 is an apocalyptic number.

121304220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121304220 is an abundant number, since it is smaller than the sum of its proper divisors (218347764).

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

121304220 is a wasteful number, since it uses less digits than its factorization.

121304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021749 (or 2021747 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 121304220 is about 11013.8195009724. The cubic root of 121304220 is about 495.0229149682.

Adding to 121304220 its reverse (22403121), we get a palindrome (143707341).

The spelling of 121304220 in words is "one hundred twenty-one million, three hundred four thousand, two hundred twenty".