12121340442 has 32 divisors (see below), whose sum is σ = 26496751104. Its totient is φ = 3680102400.

The previous prime is 12121340417. The next prime is 12121340449. The reversal of 12121340442 is 24404312121.

It is a super-2 number, since 2×12121340442² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12121340449) 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 15 ways as a sum of consecutive naturals, for example, 1913559 + ... + 1919882.

It is an arithmetic number, because the mean of its divisors is an integer number (828023472).

Almost surely, 2^12121340442 is an apocalyptic number.

12121340442 is an abundant number, since it is smaller than the sum of its proper divisors (14375410662).

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

12121340442 is a wasteful number, since it uses less digits than its factorization.

12121340442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833494.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 12121340442 its reverse (24404312121), we get a palindrome (36525652563).

The spelling of 12121340442 in words is "twelve billion, one hundred twenty-one million, three hundred forty thousand, four hundred forty-two".