9917222002721 has 16 divisors (see below), whose sum is σ = 11106597374208. Its totient is φ = 8776764796800.

The previous prime is 9917222002697. The next prime is 9917222002783. The reversal of 9917222002721 is 1272002227199.

It is not a de Polignac number, because 9917222002721 - 2¹⁸ = 9917221740577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9917222001721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23537846 + ... + 23955471.

It is an arithmetic number, because the mean of its divisors is an integer number (694162335888).

Almost surely, 2^{9917222002721} is an apocalyptic number.

It is an amenable number.

9917222002721 is a deficient number, since it is larger than the sum of its proper divisors (1189375371487).

9917222002721 is a wasteful number, since it uses less digits than its factorization.

9917222002721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47493832.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 9917222002721 in words is "nine trillion, nine hundred seventeen billion, two hundred twenty-two million, two thousand, seven hundred twenty-one".