121212120312 has 48 divisors (see below), whose sum is σ = 328302000000. Its totient is φ = 40401680256.

The previous prime is 121212120277. The next prime is 121212120397. The reversal of 121212120312 is 213021212121.

121212120312 is a `hidden beast` number, since 1 + 21 + 212 + 120 + 312 = 666.

It is a super-2 number, since 2×121212120312² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1551564 + ... + 1627812.

It is an arithmetic number, because the mean of its divisors is an integer number (6839625000).

Almost surely, 2^121212120312 is an apocalyptic number.

121212120312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121212120312 is an abundant number, since it is smaller than the sum of its proper divisors (207089879688).

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

121212120312 is a wasteful number, since it uses less digits than its factorization.

121212120312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98340 (or 98333 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121212120312 its reverse (213021212121), we get a palindrome (334233332433).

The spelling of 121212120312 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, three hundred twelve".