9421859821 has 16 divisors (see below), whose sum is σ = 10971763200. Its totient is φ = 8000218800.

The previous prime is 9421859807. The next prime is 9421859827. The reversal of 9421859821 is 1289581249.

It is a cyclic number.

It is not a de Polignac number, because 9421859821 - 2⁷ = 9421859693 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 (9421859827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302631 + ... + 332308.

It is an arithmetic number, because the mean of its divisors is an integer number (685735200).

Almost surely, 2^9421859821 is an apocalyptic number.

It is an amenable number.

9421859821 is a deficient number, since it is larger than the sum of its proper divisors (1549903379).

9421859821 is a wasteful number, since it uses less digits than its factorization.

9421859821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635040.

The product of its digits is 414720, while the sum is 49.

The square root of 9421859821 is about 97066.2651027637. The cubic root of 9421859821 is about 2112.0889908512.

The spelling of 9421859821 in words is "nine billion, four hundred twenty-one million, eight hundred fifty-nine thousand, eight hundred twenty-one".