1351231717421 has 4 divisors (see below), whose sum is σ = 1351244928192. Its totient is φ = 1351218506652.

The previous prime is 1351231717399. The next prime is 1351231717453. The reversal of 1351231717421 is 1247171321531.

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.

It is a cyclic number.

It is not a de Polignac number, because 1351231717421 - 2²⁶ = 1351164608557 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 (1351231717721) 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, 6450755 + ... + 6656928.

It is an arithmetic number, because the mean of its divisors is an integer number (337811232048).

Almost surely, 2^{1351231717421} is an apocalyptic number.

It is an amenable number.

1351231717421 is a deficient number, since it is larger than the sum of its proper divisors (13210771).

1351231717421 is a wasteful number, since it uses less digits than its factorization.

1351231717421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13210770.

The product of its digits is 35280, while the sum is 38.

The spelling of 1351231717421 in words is "one trillion, three hundred fifty-one billion, two hundred thirty-one million, seven hundred seventeen thousand, four hundred twenty-one".