221723085 has 24 divisors (see below), whose sum is σ = 358680096. Its totient is φ = 116958720.

The previous prime is 221723081. The next prime is 221723087. The reversal of 221723085 is 580327122.

It is not a de Polignac number, because 221723085 - 2² = 221723081 is a prime.

It is a super-2 number, since 2×221723085² = 98322252843834450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221723081) 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 23 ways as a sum of consecutive naturals, for example, 140350 + ... + 141920.

It is an arithmetic number, because the mean of its divisors is an integer number (14945004).

Almost surely, 2^221723085 is an apocalyptic number.

It is an amenable number.

221723085 is a deficient number, since it is larger than the sum of its proper divisors (136957011).

221723085 is an equidigital number, since it uses as much as digits as its factorization.

221723085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 221723085 is about 14890.3688671571. The cubic root of 221723085 is about 605.2530280552.

The spelling of 221723085 in words is "two hundred twenty-one million, seven hundred twenty-three thousand, eighty-five".