85222121 has 4 divisors (see below), whose sum is σ = 85594500. Its totient is φ = 84849744.

The previous prime is 85222117. The next prime is 85222127. The reversal of 85222121 is 12122258.

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

It can be written as a sum of positive squares in 2 ways, for example, as 83466496 + 1755625 = 9136^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 85222121 - 2² = 85222117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85222127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185846 + ... + 186303.

It is an arithmetic number, because the mean of its divisors is an integer number (21398625).

Almost surely, 2^85222121 is an apocalyptic number.

It is an amenable number.

85222121 is a deficient number, since it is larger than the sum of its proper divisors (372379).

85222121 is a wasteful number, since it uses less digits than its factorization.

85222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372378.

The product of its digits is 640, while the sum is 23.

The square root of 85222121 is about 9231.5828003653. The cubic root of 85222121 is about 440.0656255421.

Adding to 85222121 its reverse (12122258), we get a palindrome (97344379).

The spelling of 85222121 in words is "eighty-five million, two hundred twenty-two thousand, one hundred twenty-one".