85821121 has 8 divisors (see below), whose sum is σ = 88894080. Its totient is φ = 82755792.

The previous prime is 85821091. The next prime is 85821137. The reversal of 85821121 is 12112858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85821121 - 2⁵ = 85821089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85821121.

It is not an unprimeable number, because it can be changed into a prime (85821191) 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, 30646 + ... + 33328.

It is an arithmetic number, because the mean of its divisors is an integer number (11111760).

Almost surely, 2^85821121 is an apocalyptic number.

It is an amenable number.

85821121 is a deficient number, since it is larger than the sum of its proper divisors (3072959).

85821121 is a wasteful number, since it uses less digits than its factorization.

85821121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815.

The product of its digits is 1280, while the sum is 28.

The square root of 85821121 is about 9263.9689658375. The cubic root of 85821121 is about 441.0942478484.

Adding to 85821121 its reverse (12112858), we get a palindrome (97933979).

The spelling of 85821121 in words is "eighty-five million, eight hundred twenty-one thousand, one hundred twenty-one".