1321011212321 has 4 divisors (see below), whose sum is σ = 1321279007892. Its totient is φ = 1320743416752.

The previous prime is 1321011212299. The next prime is 1321011212341. The reversal of 1321011212321 is 1232121101231.

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 425839774096 + 895171438225 = 652564^2 + 946135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321011212321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321011212293 and 1321011212302.

It is not an unprimeable number, because it can be changed into a prime (1321011212341) 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, 133890386 + ... + 133900251.

It is an arithmetic number, because the mean of its divisors is an integer number (330319751973).

Almost surely, 2^{1321011212321} is an apocalyptic number.

It is an amenable number.

1321011212321 is a deficient number, since it is larger than the sum of its proper divisors (267795571).

1321011212321 is an equidigital number, since it uses as much as digits as its factorization.

1321011212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267795570.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1321011212321 its reverse (1232121101231), we get a palindrome (2553132313552).

The spelling of 1321011212321 in words is "one trillion, three hundred twenty-one billion, eleven million, two hundred twelve thousand, three hundred twenty-one".