9907875926821 has 2 divisors, whose sum is σ = 9907875926822. Its totient is φ = 9907875926820.

The previous prime is 9907875926803. The next prime is 9907875926843. The reversal of 9907875926821 is 1286295787099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5407071246721 + 4500804680100 = 2325311^2 + 2121510^2 .

It is a cyclic number.

It is not a de Polignac number, because 9907875926821 - 2²⁹ = 9907339055909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9907875920821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4953937963410 + 4953937963411.

It is an arithmetic number, because the mean of its divisors is an integer number (4953937963411).

Almost surely, 2^{9907875926821} is an apocalyptic number.

It is an amenable number.

9907875926821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9907875926821 is an equidigital number, since it uses as much as digits as its factorization.

9907875926821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 274337280, while the sum is 73.

The spelling of 9907875926821 in words is "nine trillion, nine hundred seven billion, eight hundred seventy-five million, nine hundred twenty-six thousand, eight hundred twenty-one".