9421420091 has 2 divisors, whose sum is σ = 9421420092. Its totient is φ = 9421420090.

The previous prime is 9421420061. The next prime is 9421420181. The reversal of 9421420091 is 1900241249.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9421420091 - 2²⁶ = 9354311227 is a prime.

It is not a weakly prime, because it can be changed into another prime (9421420051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710710045 + 4710710046.

It is an arithmetic number, because the mean of its divisors is an integer number (4710710046).

Almost surely, 2^9421420091 is an apocalyptic number.

9421420091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9421420091 is an equidigital number, since it uses as much as digits as its factorization.

9421420091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 9421420091 is about 97063.9999742438. Note that the first 4 decimals coincide. The cubic root of 9421420091 is about 2112.0561323937.

The spelling of 9421420091 in words is "nine billion, four hundred twenty-one million, four hundred twenty thousand, ninety-one".