9221721599 has 4 divisors (see below), whose sum is σ = 9446641680. Its totient is φ = 8996801520.

The previous prime is 9221721589. The next prime is 9221721701. The reversal of 9221721599 is 9951271229.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9221721599 - 2¹⁶ = 9221656063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9221721539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112459979 + ... + 112460060.

It is an arithmetic number, because the mean of its divisors is an integer number (2361660420).

Almost surely, 2^9221721599 is an apocalyptic number.

9221721599 is a deficient number, since it is larger than the sum of its proper divisors (224920081).

9221721599 is a wasteful number, since it uses less digits than its factorization.

9221721599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224920080.

The product of its digits is 204120, while the sum is 47.

The square root of 9221721599 is about 96029.7953710201. The cubic root of 9221721599 is about 2097.0269038311.

The spelling of 9221721599 in words is "nine billion, two hundred twenty-one million, seven hundred twenty-one thousand, five hundred ninety-nine".