9912182221 has 2 divisors, whose sum is σ = 9912182222. Its totient is φ = 9912182220.

The previous prime is 9912182191. The next prime is 9912182261. The reversal of 9912182221 is 1222812199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5672349225 + 4239832996 = 75315^2 + 65114^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912182221 - 2⁹ = 9912181709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9912182261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956091110 + 4956091111.

It is an arithmetic number, because the mean of its divisors is an integer number (4956091111).

Almost surely, 2^9912182221 is an apocalyptic number.

It is an amenable number.

9912182221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912182221 is an equidigital number, since it uses as much as digits as its factorization.

9912182221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 9912182221 is about 99559.9428535392. The cubic root of 9912182221 is about 2148.1095494303.

The spelling of 9912182221 in words is "nine billion, nine hundred twelve million, one hundred eighty-two thousand, two hundred twenty-one".