9420521309 has 16 divisors (see below), whose sum is σ = 10442467200. Its totient is φ = 8458312896.

The previous prime is 9420521303. The next prime is 9420521311. The reversal of 9420521309 is 9031250249.

It is a cyclic number.

It is not a de Polignac number, because 9420521309 - 2¹⁶ = 9420455773 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 (9420521303) 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, 51254 + ... + 146519.

It is an arithmetic number, because the mean of its divisors is an integer number (652654200).

Almost surely, 2^9420521309 is an apocalyptic number.

It is an amenable number.

9420521309 is a deficient number, since it is larger than the sum of its proper divisors (1021945891).

9420521309 is a wasteful number, since it uses less digits than its factorization.

9420521309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197924.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 9420521309 is about 97059.3700216522. The cubic root of 9420521309 is about 2111.9889684778.

The spelling of 9420521309 in words is "nine billion, four hundred twenty million, five hundred twenty-one thousand, three hundred nine".