671343126421 has 48 divisors (see below), whose sum is σ = 806695859200. Its totient is φ = 556309464480.

The previous prime is 671343126379. The next prime is 671343126427. The reversal of 671343126421 is 124621343176.

671343126421 = 187964² + 187965² + ... + 187982².

It is not a de Polignac number, because 671343126421 - 2³⁹ = 121587312533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671343126427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6572740 + ... + 6674098.

Almost surely, 2^671343126421 is an apocalyptic number.

It is an amenable number.

671343126421 is a deficient number, since it is larger than the sum of its proper divisors (135352732779).

671343126421 is a wasteful number, since it uses less digits than its factorization.

671343126421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101510 (or 101499 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

Adding to 671343126421 its reverse (124621343176), we get a palindrome (795964469597).

It can be divided in two parts, 6713 and 43126421, that added together give a palindrome (43133134).

The spelling of 671343126421 in words is "six hundred seventy-one billion, three hundred forty-three million, one hundred twenty-six thousand, four hundred twenty-one".