121818201312 has 48 divisors (see below), whose sum is σ = 320501301120. Its totient is φ = 40513556352.

The previous prime is 121818201311. The next prime is 121818201331. The reversal of 121818201312 is 213102818121.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 121818201312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121818201311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1403118 + ... + 1487405.

It is an arithmetic number, because the mean of its divisors is an integer number (6677110440).

Almost surely, 2^121818201312 is an apocalyptic number.

121818201312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121818201312 is an abundant number, since it is smaller than the sum of its proper divisors (198683099808).

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

121818201312 is a wasteful number, since it uses less digits than its factorization.

121818201312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890975 (or 2890967 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 30.

The spelling of 121818201312 in words is "one hundred twenty-one billion, eight hundred eighteen million, two hundred one thousand, three hundred twelve".