9994981082221 has 2 divisors, whose sum is σ = 9994981082222. Its totient is φ = 9994981082220.

The previous prime is 9994981082173. The next prime is 9994981082341. The reversal of 9994981082221 is 1222801894999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8984322832996 + 1010658249225 = 2997386^2 + 1005315^2 .

It is a cyclic number.

It is not a de Polignac number, because 9994981082221 - 2¹⁷ = 9994980951149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9994981086221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997490541110 + 4997490541111.

It is an arithmetic number, because the mean of its divisors is an integer number (4997490541111).

Almost surely, 2^{9994981082221} is an apocalyptic number.

It is an amenable number.

9994981082221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9994981082221 is an equidigital number, since it uses as much as digits as its factorization.

9994981082221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 64.

The spelling of 9994981082221 in words is "nine trillion, nine hundred ninety-four billion, nine hundred eighty-one million, eighty-two thousand, two hundred twenty-one".