121800528 has 60 divisors (see below), whose sum is σ = 341639220. Its totient is φ = 40508928.

The previous prime is 121800527. The next prime is 121800577. The reversal of 121800528 is 825008121.

It can be written as a sum of positive squares in 2 ways, for example, as 37307664 + 84492864 = 6108^2 + 9192^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121800521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101500 + ... + 102692.

It is an arithmetic number, because the mean of its divisors is an integer number (5693987).

Almost surely, 2^121800528 is an apocalyptic number.

121800528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121800528 is an abundant number, since it is smaller than the sum of its proper divisors (219838692).

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

121800528 is a wasteful number, since it uses less digits than its factorization.

121800528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 121800528 is about 11036.3276500836. The cubic root of 121800528 is about 495.6971138987.

Adding to 121800528 its reverse (825008121), we get a palindrome (946808649).

The spelling of 121800528 in words is "one hundred twenty-one million, eight hundred thousand, five hundred twenty-eight".