221623285 has 16 divisors (see below), whose sum is σ = 298859904. Its totient is φ = 156543552.

The previous prime is 221623267. The next prime is 221623289. The reversal of 221623285 is 582326122.

It is a cyclic number.

It is not a de Polignac number, because 221623285 - 2⁹ = 221622773 is a prime.

It is a super-3 number, since 3×221623285³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221623289) 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, 72627 + ... + 75616.

It is an arithmetic number, because the mean of its divisors is an integer number (18678744).

Almost surely, 2^221623285 is an apocalyptic number.

It is an amenable number.

221623285 is a deficient number, since it is larger than the sum of its proper divisors (77236619).

221623285 is a wasteful number, since it uses less digits than its factorization.

221623285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148284.

The product of its digits is 11520, while the sum is 31.

The square root of 221623285 is about 14887.0173305468. The cubic root of 221623285 is about 605.1622040779.

The spelling of 221623285 in words is "two hundred twenty-one million, six hundred twenty-three thousand, two hundred eighty-five".