1321201212101 has 8 divisors (see below), whose sum is σ = 1322798615424. Its totient is φ = 1319604426720.

The previous prime is 1321201212091. The next prime is 1321201212143. The reversal of 1321201212101 is 1012121021231.

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 a de Polignac number, because none of the positive numbers 2^k-1321201212101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321201212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321201212151) 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 7 ways as a sum of consecutive naturals, for example, 4198100 + ... + 4501826.

It is an arithmetic number, because the mean of its divisors is an integer number (165349826928).

Almost surely, 2^{1321201212101} is an apocalyptic number.

It is an amenable number.

1321201212101 is a deficient number, since it is larger than the sum of its proper divisors (1597403323).

1321201212101 is a wasteful number, since it uses less digits than its factorization.

1321201212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308971.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1321201212101 its reverse (1012121021231), we get a palindrome (2333322233332).

The spelling of 1321201212101 in words is "one trillion, three hundred twenty-one billion, two hundred one million, two hundred twelve thousand, one hundred one".