9960040021 has 2 divisors, whose sum is σ = 9960040022. Its totient is φ = 9960040020.

The previous prime is 9960040001. The next prime is 9960040033. The reversal of 9960040021 is 1200400699.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6461908996 + 3498131025 = 80386^2 + 59145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9960040021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9960040001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980020010 + 4980020011.

It is an arithmetic number, because the mean of its divisors is an integer number (4980020011).

Almost surely, 2^9960040021 is an apocalyptic number.

It is an amenable number.

9960040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9960040021 is an equidigital number, since it uses as much as digits as its factorization.

9960040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 9960040021 is about 99800.0001052104. Note that the first 3 decimals coincide. The cubic root of 9960040021 is about 2151.5611535787.

The spelling of 9960040021 in words is "nine billion, nine hundred sixty million, forty thousand, twenty-one".