9999994221 has 12 divisors (see below), whose sum is σ = 16507927072. Its totient is φ = 5714282376.

The previous prime is 9999994187. The next prime is 9999994231. The reversal of 9999994221 is 1224999999.

9999994221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9999994221 - 2¹¹ = 9999992173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 158730067 = 9999994221 / (9 + 9 + 9 + 9 + 9 + 9 + 4 + 2 + 2 + 1).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999994231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79364971 + ... + 79365096.

Almost surely, 2^9999994221 is an apocalyptic number.

It is an amenable number.

9999994221 is a deficient number, since it is larger than the sum of its proper divisors (6507932851).

9999994221 is a wasteful number, since it uses less digits than its factorization.

9999994221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158730080 (or 158730077 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 63.

The square root of 9999994221 is about 99999.9711049958. The cubic root of 9999994221 is about 2154.4342750159.

The spelling of 9999994221 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-four thousand, two hundred twenty-one".