85216121 has 8 divisors (see below), whose sum is σ = 94978080. Its totient is φ = 75981888.

The previous prime is 85216097. The next prime is 85216129. The reversal of 85216121 is 12161258.

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 85216121 - 2¹⁸ = 84953977 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85216129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131591 + ... + 132236.

It is an arithmetic number, because the mean of its divisors is an integer number (11872260).

Almost surely, 2^85216121 is an apocalyptic number.

It is an amenable number.

85216121 is a deficient number, since it is larger than the sum of its proper divisors (9761959).

85216121 is a wasteful number, since it uses less digits than its factorization.

85216121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263863.

The product of its digits is 960, while the sum is 26.

The square root of 85216121 is about 9231.2578232871. The cubic root of 85216121 is about 440.0552978021.

Adding to 85216121 its reverse (12161258), we get a palindrome (97377379).

The spelling of 85216121 in words is "eighty-five million, two hundred sixteen thousand, one hundred twenty-one".