8421857377969 has 4 divisors (see below), whose sum is σ = 9624979860544. Its totient is φ = 7218734895396.

The previous prime is 8421857377961. The next prime is 8421857377991. The reversal of 8421857377969 is 9697737581248.

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 8421857377969 - 2³ = 8421857377961 is a prime.

It is a super-2 number, since 2×8421857377969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8421857377895 and 8421857377904.

It is not an unprimeable number, because it can be changed into a prime (8421857377961) 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, 601561241277 + ... + 601561241290.

It is an arithmetic number, because the mean of its divisors is an integer number (2406244965136).

Almost surely, 2^{8421857377969} is an apocalyptic number.

It is an amenable number.

8421857377969 is a deficient number, since it is larger than the sum of its proper divisors (1203122482575).

8421857377969 is a wasteful number, since it uses less digits than its factorization.

8421857377969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203122482574.

The product of its digits is 1280240640, while the sum is 76.

The spelling of 8421857377969 in words is "eight trillion, four hundred twenty-one billion, eight hundred fifty-seven million, three hundred seventy-seven thousand, nine hundred sixty-nine".