221728725739 has 8 divisors (see below), whose sum is σ = 225923880672. Its totient is φ = 217534000320.

The previous prime is 221728725719. The next prime is 221728725767. The reversal of 221728725739 is 937527827122.

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 221728725739 - 2⁹ = 221728725227 is a prime.

It is a super-2 number, since 2×221728725739² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221728725739.

It is not an unprimeable number, because it can be changed into a prime (221728725719) 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, 1052154 + ... + 1245184.

It is an arithmetic number, because the mean of its divisors is an integer number (28240485084).

Almost surely, 2^221728725739 is an apocalyptic number.

221728725739 is a deficient number, since it is larger than the sum of its proper divisors (4195154933).

221728725739 is a wasteful number, since it uses less digits than its factorization.

221728725739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214757.

The product of its digits is 5927040, while the sum is 55.

The spelling of 221728725739 in words is "two hundred twenty-one billion, seven hundred twenty-eight million, seven hundred twenty-five thousand, seven hundred thirty-nine".