121513220 has 48 divisors (see below), whose sum is σ = 262149888. Its totient is φ = 47295360.

The previous prime is 121513193. The next prime is 121513237. The reversal of 121513220 is 22315121.

It is a happy 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, 125177 + ... + 126143.

It is an arithmetic number, because the mean of its divisors is an integer number (5461456).

Almost surely, 2^121513220 is an apocalyptic number.

121513220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121513220 is an abundant number, since it is smaller than the sum of its proper divisors (140636668).

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

121513220 is a wasteful number, since it uses less digits than its factorization.

121513220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1138 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 121513220 is about 11023.3034975909. The cubic root of 121513220 is about 495.3070502540.

Adding to 121513220 its reverse (22315121), we get a palindrome (143828341).

The spelling of 121513220 in words is "one hundred twenty-one million, five hundred thirteen thousand, two hundred twenty".