221553985 has 8 divisors (see below), whose sum is σ = 266060160. Its totient is φ = 177112944.

The previous prime is 221553971. The next prime is 221553989. The reversal of 221553985 is 589355122.

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 221553985 - 2⁹ = 221553473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221553989) 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, 8455 + ... + 22684.

It is an arithmetic number, because the mean of its divisors is an integer number (33257520).

Almost surely, 2^221553985 is an apocalyptic number.

It is an amenable number.

221553985 is a deficient number, since it is larger than the sum of its proper divisors (44506175).

221553985 is a wasteful number, since it uses less digits than its factorization.

221553985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32567.

The product of its digits is 108000, while the sum is 40.

The square root of 221553985 is about 14884.6896171872. The cubic root of 221553985 is about 605.0991208859.

The spelling of 221553985 in words is "two hundred twenty-one million, five hundred fifty-three thousand, nine hundred eighty-five".