221572085 has 8 divisors (see below), whose sum is σ = 303870336. Its totient is φ = 151935120.

The previous prime is 221572079. The next prime is 221572121. The reversal of 221572085 is 580275122.

It is a happy number.

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

It is not a de Polignac number, because 221572085 - 2²⁰ = 220523509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3165281 + ... + 3165350.

It is an arithmetic number, because the mean of its divisors is an integer number (37983792).

Almost surely, 2^221572085 is an apocalyptic number.

It is an amenable number.

221572085 is a deficient number, since it is larger than the sum of its proper divisors (82298251).

221572085 is an equidigital number, since it uses as much as digits as its factorization.

221572085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6330643.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 221572085 is about 14885.2976120735. The cubic root of 221572085 is about 605.1155984287.

It can be divided in two parts, 22157 and 2085, that added together give a palindrome (24242).

The spelling of 221572085 in words is "two hundred twenty-one million, five hundred seventy-two thousand, eighty-five".