1312000421 has 4 divisors (see below), whose sum is σ = 1312073952. Its totient is φ = 1311926892.

The previous prime is 1312000373. The next prime is 1312000447. The reversal of 1312000421 is 1240002131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1240002131 = 263 ⋅4714837.

It is a cyclic number.

It is not a de Polignac number, because 1312000421 - 2⁶ = 1312000357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312000396 and 1312000405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312000471) 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, 8936 + ... + 51998.

It is an arithmetic number, because the mean of its divisors is an integer number (328018488).

Almost surely, 2^1312000421 is an apocalyptic number.

It is an amenable number.

1312000421 is a deficient number, since it is larger than the sum of its proper divisors (73531).

1312000421 is an equidigital number, since it uses as much as digits as its factorization.

1312000421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73530.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1312000421 is about 36221.5463640083. The cubic root of 1312000421 is about 1094.7408520547.

Adding to 1312000421 its reverse (1240002131), we get a palindrome (2552002552).

The spelling of 1312000421 in words is "one billion, three hundred twelve million, four hundred twenty-one", and thus it is an aban number.