9599900021 has 2 divisors, whose sum is σ = 9599900022. Its totient is φ = 9599900020.

The previous prime is 9599900003. The next prime is 9599900041. The reversal of 9599900021 is 1200099959.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5989212100 + 3610687921 = 77390^2 + 60089^2 .

It is an emirp because it is prime and its reverse (1200099959) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9599900021 - 2¹⁴ = 9599883637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9599900041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4799950010 + 4799950011.

It is an arithmetic number, because the mean of its divisors is an integer number (4799950011).

Almost surely, 2^9599900021 is an apocalyptic number.

It is an amenable number.

9599900021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9599900021 is an equidigital number, since it uses as much as digits as its factorization.

9599900021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 9599900021 is about 97979.0795068008. The cubic root of 9599900021 is about 2125.3097603159.

The spelling of 9599900021 in words is "nine billion, five hundred ninety-nine million, nine hundred thousand, twenty-one".