1321000013121 has 8 divisors (see below), whose sum is σ = 1761899890560. Its totient is φ = 880383405552.

The previous prime is 1321000013093. The next prime is 1321000013191. The reversal of 1321000013121 is 1213100001231.

It is a happy number.

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

It is not a de Polignac number, because 1321000013121 - 2⁵ = 1321000013089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321000013121.

It is not an unprimeable number, because it can be changed into a prime (1321000013191) 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 7 ways as a sum of consecutive naturals, for example, 70806585 + ... + 70825238.

It is an arithmetic number, because the mean of its divisors is an integer number (220237486320).

Almost surely, 2^{1321000013121} is an apocalyptic number.

It is an amenable number.

1321000013121 is a deficient number, since it is larger than the sum of its proper divisors (440899877439).

1321000013121 is a wasteful number, since it uses less digits than its factorization.

1321000013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141634935.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1321000013121 its reverse (1213100001231), we get a palindrome (2534100014352).

The spelling of 1321000013121 in words is "one trillion, three hundred twenty-one billion, thirteen thousand, one hundred twenty-one".