1321304011021 has 4 divisors (see below), whose sum is σ = 1323676191132. Its totient is φ = 1318931830912.

The previous prime is 1321304010941. The next prime is 1321304011121. The reversal of 1321304011021 is 1201104031231.

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 262360108521 + 1058943902500 = 512211^2 + 1029050^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321304011021 - 2²⁵ = 1321270456589 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 1321304011021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321304011121) 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, 1186089220 + ... + 1186090333.

It is an arithmetic number, because the mean of its divisors is an integer number (330919047783).

Almost surely, 2^{1321304011021} is an apocalyptic number.

It is an amenable number.

1321304011021 is a deficient number, since it is larger than the sum of its proper divisors (2372180111).

1321304011021 is an equidigital number, since it uses as much as digits as its factorization.

1321304011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372180110.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1321304011021 its reverse (1201104031231), we get a palindrome (2522408042252).

The spelling of 1321304011021 in words is "one trillion, three hundred twenty-one billion, three hundred four million, eleven thousand, twenty-one".