20120001212321 has 4 divisors (see below), whose sum is σ = 20120059615044. Its totient is φ = 20119942809600.

The previous prime is 20120001212317. The next prime is 20120001212327. The reversal of 20120001212321 is 12321210002102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9702851203600 + 10417150008721 = 3114940^2 + 3227561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120001212321 - 2² = 20120001212317 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 20120001212321.

It is not an unprimeable number, because it can be changed into a prime (20120001212327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28681520 + ... + 29374641.

It is an arithmetic number, because the mean of its divisors is an integer number (5030014903761).

Almost surely, 2^{20120001212321} is an apocalyptic number.

It is an amenable number.

20120001212321 is a deficient number, since it is larger than the sum of its proper divisors (58402723).

20120001212321 is an equidigital number, since it uses as much as digits as its factorization.

20120001212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58402722.

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

Adding to 20120001212321 its reverse (12321210002102), we get a palindrome (32441211214423).

The spelling of 20120001212321 in words is "twenty trillion, one hundred twenty billion, one million, two hundred twelve thousand, three hundred twenty-one".