12120121332 has 54 divisors (see below), whose sum is σ = 33675362994. Its totient is φ = 3672762720.

The previous prime is 12120121319. The next prime is 12120121333. The reversal of 12120121332 is 23312102121.

12120121332 is a `hidden beast` number, since 1 + 212 + 0 + 121 + 332 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6762759696 + 5357361636 = 82236^2 + 73194^2 .

It is a super-2 number, since 2×12120121332² (a number of 21 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 not an unprimeable number, because it can be changed into a prime (12120121333) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1386843 + ... + 1395554.

Almost surely, 2^12120121332 is an apocalyptic number.

12120121332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12120121332 is an abundant number, since it is smaller than the sum of its proper divisors (21555241662).

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

12120121332 is a wasteful number, since it uses less digits than its factorization.

12120121332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782429 (or 2782413 counting only the distinct ones).

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

Adding to 12120121332 its reverse (23312102121), we get a palindrome (35432223453).

The spelling of 12120121332 in words is "twelve billion, one hundred twenty million, one hundred twenty-one thousand, three hundred thirty-two".