20121212321 has 8 divisors (see below), whose sum is σ = 23040853440. Its totient is φ = 17212866768.

The previous prime is 20121212317. The next prime is 20121212329. The reversal of 20121212321 is 12321212102.

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 20121212321 - 2² = 20121212317 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 20121212321.

It is not an unprimeable number, because it can be changed into a prime (20121212329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2820071 + ... + 2827196.

It is an arithmetic number, because the mean of its divisors is an integer number (2880106680).

Almost surely, 2^20121212321 is an apocalyptic number.

It is an amenable number.

20121212321 is a deficient number, since it is larger than the sum of its proper divisors (2919641119).

20121212321 is an equidigital number, since it uses as much as digits as its factorization.

20121212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5647783.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121212321 its reverse (12321212102), we get a palindrome (32442424423).

The spelling of 20121212321 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty-one".