2209016721 has 8 divisors (see below), whose sum is σ = 2945574144. Its totient is φ = 1472568560.

The previous prime is 2209016701. The next prime is 2209016743. The reversal of 2209016721 is 1276109022.

2209016721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2209016721 - 2¹¹ = 2209014673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2209016701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57376 + ... + 87806.

It is an arithmetic number, because the mean of its divisors is an integer number (368196768).

Almost surely, 2^2209016721 is an apocalyptic number.

It is an amenable number.

2209016721 is a deficient number, since it is larger than the sum of its proper divisors (736557423).

2209016721 is a wasteful number, since it uses less digits than its factorization.

2209016721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54631.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2209016721 is about 47000.1778826421. The cubic root of 2209016721 is about 1302.3658537334.

The spelling of 2209016721 in words is "two billion, two hundred nine million, sixteen thousand, seven hundred twenty-one".