85017221 has 8 divisors (see below), whose sum is σ = 92922624. Its totient is φ = 77434560.

The previous prime is 85017211. The next prime is 85017239. The reversal of 85017221 is 12271058.

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 85017221 - 2¹⁴ = 85000837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85017211) 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, 80135 + ... + 81188.

It is an arithmetic number, because the mean of its divisors is an integer number (11615328).

Almost surely, 2^85017221 is an apocalyptic number.

It is an amenable number.

85017221 is a deficient number, since it is larger than the sum of its proper divisors (7905403).

85017221 is a wasteful number, since it uses less digits than its factorization.

85017221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161371.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 85017221 is about 9220.4783498471. The cubic root of 85017221 is about 439.7126584671.

Adding to 85017221 its reverse (12271058), we get a palindrome (97288279).

The spelling of 85017221 in words is "eighty-five million, seventeen thousand, two hundred twenty-one".