9421412821 has 2 divisors, whose sum is σ = 9421412822. Its totient is φ = 9421412820.

The previous prime is 9421412813. The next prime is 9421412839. The reversal of 9421412821 is 1282141249.

It is a happy number.

9421412821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8735706225 + 685706596 = 93465^2 + 26186^2 .

It is a cyclic number.

It is not a de Polignac number, because 9421412821 - 2³ = 9421412813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9421415821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710706410 + 4710706411.

It is an arithmetic number, because the mean of its divisors is an integer number (4710706411).

Almost surely, 2^9421412821 is an apocalyptic number.

It is an amenable number.

9421412821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9421412821 is an equidigital number, since it uses as much as digits as its factorization.

9421412821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 9421412821 is about 97063.9625247187. The cubic root of 9421412821 is about 2112.0555891404.

The spelling of 9421412821 in words is "nine billion, four hundred twenty-one million, four hundred twelve thousand, eight hundred twenty-one".