1312424021 has 8 divisors (see below), whose sum is σ = 1390008600. Its totient is φ = 1234882048.

The previous prime is 1312424017. The next prime is 1312424033. The reversal of 1312424021 is 1204242131.

It can be written as a sum of positive squares in 4 ways, for example, as 361380100 + 951043921 = 19010^2 + 30839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312424021 - 2² = 1312424017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312423984 and 1312424002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312424051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70505 + ... + 87153.

It is an arithmetic number, because the mean of its divisors is an integer number (173751075).

Almost surely, 2^1312424021 is an apocalyptic number.

It is an amenable number.

1312424021 is a deficient number, since it is larger than the sum of its proper divisors (77584579).

1312424021 is a wasteful number, since it uses less digits than its factorization.

1312424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21303.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1312424021 is about 36227.3932404748. The cubic root of 1312424021 is about 1094.8586574859.

Adding to 1312424021 its reverse (1204242131), we get a palindrome (2516666152).

The spelling of 1312424021 in words is "one billion, three hundred twelve million, four hundred twenty-four thousand, twenty-one".