9421505209 has 2 divisors, whose sum is σ = 9421505210. Its totient is φ = 9421505208.

The previous prime is 9421505141. The next prime is 9421505237. The reversal of 9421505209 is 9025051249.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5481181225 + 3940323984 = 74035^2 + 62772^2 .

It is a cyclic number.

It is not a de Polignac number, because 9421505209 - 2³³ = 831570617 is a prime.

It is not a weakly prime, because it can be changed into another prime (9421505309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710752604 + 4710752605.

It is an arithmetic number, because the mean of its divisors is an integer number (4710752605).

Almost surely, 2^9421505209 is an apocalyptic number.

It is an amenable number.

9421505209 is a deficient number, since it is larger than the sum of its proper divisors (1).

9421505209 is an equidigital number, since it uses as much as digits as its factorization.

9421505209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 9421505209 is about 97064.4384365356. The cubic root of 9421505209 is about 2112.0624928451.

The spelling of 9421505209 in words is "nine billion, four hundred twenty-one million, five hundred five thousand, two hundred nine".