1312240421005 has 16 divisors (see below), whose sum is σ = 1589207217840. Its totient is φ = 1040114068992.

The previous prime is 1312240420993. The next prime is 1312240421033. The reversal of 1312240421005 is 5001240422131.

It can be written as a sum of positive squares in 8 ways, for example, as 170005308489 + 1142235112516 = 412317^2 + 1068754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312240421005 - 2⁹ = 1312240420493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16690647 + ... + 16769083.

It is an arithmetic number, because the mean of its divisors is an integer number (99325451115).

Almost surely, 2^{1312240421005} is an apocalyptic number.

It is an amenable number.

1312240421005 is a deficient number, since it is larger than the sum of its proper divisors (276966796835).

1312240421005 is a wasteful number, since it uses less digits than its factorization.

1312240421005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109248.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 1312240421005 its reverse (5001240422131), we get a palindrome (6313480843136).

The spelling of 1312240421005 in words is "one trillion, three hundred twelve billion, two hundred forty million, four hundred twenty-one thousand, five".