85842121 has 4 divisors (see below), whose sum is σ = 85946500. Its totient is φ = 85737744.

The previous prime is 85842103. The next prime is 85842137. The reversal of 85842121 is 12124858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12124858 = 2 ⋅6062429.

It can be written as a sum of positive squares in 2 ways, for example, as 36772096 + 49070025 = 6064^2 + 7005^2 .

It is a cyclic number.

It is not a de Polignac number, because 85842121 - 2¹³ = 85833929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85842101) 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, 50946 + ... + 52603.

It is an arithmetic number, because the mean of its divisors is an integer number (21486625).

Almost surely, 2^85842121 is an apocalyptic number.

It is an amenable number.

85842121 is a deficient number, since it is larger than the sum of its proper divisors (104379).

85842121 is a wasteful number, since it uses less digits than its factorization.

85842121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104378.

The product of its digits is 5120, while the sum is 31.

The square root of 85842121 is about 9265.1023199963. The cubic root of 85842121 is about 441.1302227679.

Adding to 85842121 its reverse (12124858), we get a palindrome (97966979).

The spelling of 85842121 in words is "eighty-five million, eight hundred forty-two thousand, one hundred twenty-one".