121565566212 has 24 divisors (see below), whose sum is σ = 287886616416. Its totient is φ = 39917051328.

The previous prime is 121565566189. The next prime is 121565566259. The reversal of 121565566212 is 212665565121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75599673 + ... + 75601280.

It is an arithmetic number, because the mean of its divisors is an integer number (11995275684).

Almost surely, 2^121565566212 is an apocalyptic number.

121565566212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121565566212 is an abundant number, since it is smaller than the sum of its proper divisors (166321050204).

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

121565566212 is a wasteful number, since it uses less digits than its factorization.

121565566212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151201027 (or 151201025 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The spelling of 121565566212 in words is "one hundred twenty-one billion, five hundred sixty-five million, five hundred sixty-six thousand, two hundred twelve".