121212120309 has 48 divisors (see below), whose sum is σ = 190224777600. Its totient is φ = 68448675456.

The previous prime is 121212120277. The next prime is 121212120397. The reversal of 121212120309 is 903021212121.

It is not a de Polignac number, because 121212120309 - 2⁵ = 121212120277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212128309) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6223224 + ... + 6242670.

It is an arithmetic number, because the mean of its divisors is an integer number (3963016200).

Almost surely, 2^121212120309 is an apocalyptic number.

It is an amenable number.

121212120309 is a deficient number, since it is larger than the sum of its proper divisors (69012657291).

121212120309 is a wasteful number, since it uses less digits than its factorization.

121212120309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19962 (or 19955 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 121212120309 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, three hundred nine".