85222521 has 12 divisors (see below), whose sum is σ = 128451648. Its totient is φ = 54344664.

The previous prime is 85222519. The next prime is 85222531. The reversal of 85222521 is 12522258.

It is not a de Polignac number, because 85222521 - 2¹ = 85222519 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (85222531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205645 + ... + 206058.

It is an arithmetic number, because the mean of its divisors is an integer number (10704304).

Almost surely, 2^85222521 is an apocalyptic number.

It is an amenable number.

85222521 is a deficient number, since it is larger than the sum of its proper divisors (43229127).

85222521 is a wasteful number, since it uses less digits than its factorization.

85222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411732 (or 411729 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 85222521 is about 9231.6044650971. The cubic root of 85222521 is about 440.0663140409.

Adding to 85222521 its reverse (12522258), we get a palindrome (97744779).

The spelling of 85222521 in words is "eighty-five million, two hundred twenty-two thousand, five hundred twenty-one".