12121211331023 has 4 divisors (see below), whose sum is σ = 12130688432640. Its totient is φ = 12111734229408.

The previous prime is 12121211330983. The next prime is 12121211331041. The reversal of 12121211331023 is 32013311212121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12121211331023 - 2²² = 12121207136719 is a prime.

It is a super-3 number, since 3×12121211331023³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121211331023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121211831023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4738548890 + ... + 4738551447.

It is an arithmetic number, because the mean of its divisors is an integer number (3032672108160).

Almost surely, 2^{12121211331023} is an apocalyptic number.

12121211331023 is a deficient number, since it is larger than the sum of its proper divisors (9477101617).

12121211331023 is an equidigital number, since it uses as much as digits as its factorization.

12121211331023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9477101616.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 12121211331023 its reverse (32013311212121), we get a palindrome (44134522543144).

The spelling of 12121211331023 in words is "twelve trillion, one hundred twenty-one billion, two hundred eleven million, three hundred thirty-one thousand, twenty-three".