1305352213021 has 4 divisors (see below), whose sum is σ = 1309997594844. Its totient is φ = 1300706831200.

The previous prime is 1305352213001. The next prime is 1305352213043. The reversal of 1305352213021 is 1203122535031.

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 689582428921 + 615769784100 = 830411^2 + 784710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305352213021 - 2⁹ = 1305352212509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305352213001) 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, 2322690490 + ... + 2322691051.

It is an arithmetic number, because the mean of its divisors is an integer number (327499398711).

Almost surely, 2^{1305352213021} is an apocalyptic number.

It is an amenable number.

1305352213021 is a deficient number, since it is larger than the sum of its proper divisors (4645381823).

1305352213021 is an equidigital number, since it uses as much as digits as its factorization.

1305352213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4645381822.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 1305352213021 its reverse (1203122535031), we get a palindrome (2508474748052).

The spelling of 1305352213021 in words is "one trillion, three hundred five billion, three hundred fifty-two million, two hundred thirteen thousand, twenty-one".