121516812 has 18 divisors (see below), whose sum is σ = 307167588. Its totient is φ = 40505592.

The previous prime is 121516741. The next prime is 121516823. The reversal of 121516812 is 218615121.

It is a tau number, because it is divible by the number of its divisors (18).

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1687698 + ... + 1687769.

It is an arithmetic number, because the mean of its divisors is an integer number (17064866).

Almost surely, 2^121516812 is an apocalyptic number.

121516812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121516812 is an abundant number, since it is smaller than the sum of its proper divisors (185650776).

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

121516812 is a wasteful number, since it uses less digits than its factorization.

121516812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375477 (or 3375472 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 121516812 is about 11023.4664239521. The cubic root of 121516812 is about 495.3119307254.

The spelling of 121516812 in words is "one hundred twenty-one million, five hundred sixteen thousand, eight hundred twelve".