12121023312 has 60 divisors (see below), whose sum is σ = 35016302464. Its totient is φ = 3910006080.

The previous prime is 12121023301. The next prime is 12121023319. The reversal of 12121023312 is 21332012121.

12121023312 is a `hidden beast` number, since 121 + 210 + 2 + 331 + 2 = 666.

It is a super-3 number, since 3×12121023312³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121023319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1353178 + ... + 1362105.

Almost surely, 2^12121023312 is an apocalyptic number.

12121023312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12121023312 is an abundant number, since it is smaller than the sum of its proper divisors (22895279152).

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

12121023312 is a wasteful number, since it uses less digits than its factorization.

12121023312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715328 (or 2715319 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12121023312 its reverse (21332012121), we get a palindrome (33453035433).

The spelling of 12121023312 in words is "twelve billion, one hundred twenty-one million, twenty-three thousand, three hundred twelve".