421373651689 has 9 divisors (see below), whose sum is σ = 422423309829. Its totient is φ = 420326600160.

The previous prime is 421373651687. The next prime is 421373651693. The reversal of 421373651689 is 986156373124.

It is a happy number.

The square root of 421373651689 is 649133.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 385995051225 + 35378600464 = 621285^2 + 188092^2 .

It is not a de Polignac number, because 421373651689 - 2¹ = 421373651687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421373651687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 493989787 + ... + 493990639.

Almost surely, 2^421373651689 is an apocalyptic number.

421373651689 is the 649133-rd square number.

421373651689 is the 324567-th centered octagonal number.

It is an amenable number.

421373651689 is a deficient number, since it is larger than the sum of its proper divisors (1049658140).

421373651689 is an frugal number, since it uses more digits than its factorization.

421373651689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228 (or 1614 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 421373651689 in words is "four hundred twenty-one billion, three hundred seventy-three million, six hundred fifty-one thousand, six hundred eighty-nine".