12121423412 has 18 divisors (see below), whose sum is σ = 24675755202. Its totient is φ = 5194895664.

The previous prime is 12121423411. The next prime is 12121423421. The reversal of 12121423412 is 21432412121.

It can be written as a sum of positive squares in only one way, i.e., 6534458896 + 5586964516 = 80836^2 + 74746^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121423411) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 30921803 + ... + 30922194.

It is an arithmetic number, because the mean of its divisors is an integer number (1370875289).

Almost surely, 2^12121423412 is an apocalyptic number.

It is an amenable number.

12121423412 is an abundant number, since it is smaller than the sum of its proper divisors (12554331790).

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

12121423412 is a wasteful number, since it uses less digits than its factorization.

12121423412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61844015 (or 61844006 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 12121423412 its reverse (21432412121), we get a palindrome (33553835533).

The spelling of 12121423412 in words is "twelve billion, one hundred twenty-one million, four hundred twenty-three thousand, four hundred twelve".