12121144021 has 8 divisors (see below), whose sum is σ = 14087528640. Its totient is φ = 10213457568.

The previous prime is 12121143977. The next prime is 12121144039. The reversal of 12121144021 is 12044112121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121144021 - 2⁹ = 12121143509 is a prime.

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 12121144021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121144081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14674096 + ... + 14674921.

It is an arithmetic number, because the mean of its divisors is an integer number (1760941080).

Almost surely, 2^12121144021 is an apocalyptic number.

It is an amenable number.

12121144021 is a deficient number, since it is larger than the sum of its proper divisors (1966384619).

12121144021 is an equidigital number, since it uses as much as digits as its factorization.

12121144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29349083.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12121144021 its reverse (12044112121), we get a palindrome (24165256142).

The spelling of 12121144021 in words is "twelve billion, one hundred twenty-one million, one hundred forty-four thousand, twenty-one".