8346420821 has 4 divisors (see below), whose sum is σ = 8446980192. Its totient is φ = 8245861452.

The previous prime is 8346420773. The next prime is 8346420829. The reversal of 8346420821 is 1280246438.

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 8346420821 - 2²² = 8342226517 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 (8346420829) 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, 50279561 + ... + 50279726.

It is an arithmetic number, because the mean of its divisors is an integer number (2111745048).

Almost surely, 2^8346420821 is an apocalyptic number.

It is an amenable number.

8346420821 is a deficient number, since it is larger than the sum of its proper divisors (100559371).

8346420821 is a wasteful number, since it uses less digits than its factorization.

8346420821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100559370.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 8346420821 is about 91358.7479172082. The cubic root of 8346420821 is about 2028.4614533108.

The spelling of 8346420821 in words is "eight billion, three hundred forty-six million, four hundred twenty thousand, eight hundred twenty-one".