85221971 has 4 divisors (see below), whose sum is σ = 85553832. Its totient is φ = 84890112.

The previous prime is 85221967. The next prime is 85222009. The reversal of 85221971 is 17912258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85221971 - 2² = 85221967 is a prime.

It is a super-2 number, since 2×85221971² = 14525568682249682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85221931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165545 + ... + 166058.

It is an arithmetic number, because the mean of its divisors is an integer number (21388458).

Almost surely, 2^85221971 is an apocalyptic number.

85221971 is a deficient number, since it is larger than the sum of its proper divisors (331861).

85221971 is a wasteful number, since it uses less digits than its factorization.

85221971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331860.

The product of its digits is 10080, while the sum is 35.

The square root of 85221971 is about 9231.5746760777. The cubic root of 85221971 is about 440.0653673545.

The spelling of 85221971 in words is "eighty-five million, two hundred twenty-one thousand, nine hundred seventy-one".