121817612 has 12 divisors (see below), whose sum is σ = 243635280. Its totient is φ = 52207536.

The previous prime is 121817609. The next prime is 121817617. The reversal of 121817612 is 216718121.

121817612 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (121817617) 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 3 ways as a sum of consecutive naturals, for example, 2175287 + ... + 2175342.

It is an arithmetic number, because the mean of its divisors is an integer number (20302940).

Almost surely, 2^121817612 is an apocalyptic number.

It is an amenable number.

121817612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121817612 is a wasteful number, since it uses less digits than its factorization.

121817612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350640 (or 4350638 counting only the distinct ones).

The product of its digits is 1344, while the sum is 29.

The square root of 121817612 is about 11037.1016122893. The cubic root of 121817612 is about 495.7202886575.

The spelling of 121817612 in words is "one hundred twenty-one million, eight hundred seventeen thousand, six hundred twelve".