1245430331221 has 4 divisors (see below), whose sum is σ = 1245434326444. Its totient is φ = 1245426336000.

The previous prime is 1245430331213. The next prime is 1245430331227. The reversal of 1245430331221 is 1221330345421.

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 1201185312196 + 44245019025 = 1095986^2 + 210345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245430331221 - 2³ = 1245430331213 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 (1245430331227) 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, 1486410 + ... + 2168011.

It is an arithmetic number, because the mean of its divisors is an integer number (311358581611).

Almost surely, 2^{1245430331221} is an apocalyptic number.

It is an amenable number.

1245430331221 is a deficient number, since it is larger than the sum of its proper divisors (3995223).

1245430331221 is an equidigital number, since it uses as much as digits as its factorization.

1245430331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995222.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 1245430331221 its reverse (1221330345421), we get a palindrome (2466760676642).

The spelling of 1245430331221 in words is "one trillion, two hundred forty-five billion, four hundred thirty million, three hundred thirty-one thousand, two hundred twenty-one".