121575820 has 12 divisors (see below), whose sum is σ = 255309264. Its totient is φ = 48630320.

The previous prime is 121575803. The next prime is 121575847. The reversal of 121575820 is 28575121.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3039376 + ... + 3039415.

It is an arithmetic number, because the mean of its divisors is an integer number (21275772).

Almost surely, 2^121575820 is an apocalyptic number.

121575820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121575820 is an abundant number, since it is smaller than the sum of its proper divisors (133733444).

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

121575820 is a wasteful number, since it uses less digits than its factorization.

121575820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078800 (or 6078798 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 121575820 is about 11026.1425711805. The cubic root of 121575820 is about 495.3920914766.

The spelling of 121575820 in words is "one hundred twenty-one million, five hundred seventy-five thousand, eight hundred twenty".