853822121 has 4 divisors (see below), whose sum is σ = 853902852. Its totient is φ = 853741392.

The previous prime is 853822117. The next prime is 853822129. The reversal of 853822121 is 121228358.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 586172521 + 267649600 = 24211^2 + 16360^2 .

It is a cyclic number.

It is not a de Polignac number, because 853822121 - 2² = 853822117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853822129) 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, 21590 + ... + 46623.

It is an arithmetic number, because the mean of its divisors is an integer number (213475713).

Almost surely, 2^853822121 is an apocalyptic number.

It is an amenable number.

853822121 is a deficient number, since it is larger than the sum of its proper divisors (80731).

853822121 is a wasteful number, since it uses less digits than its factorization.

853822121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80730.

The product of its digits is 7680, while the sum is 32.

The square root of 853822121 is about 29220.2347868733. The cubic root of 853822121 is about 948.6859472115.

The spelling of 853822121 in words is "eight hundred fifty-three million, eight hundred twenty-two thousand, one hundred twenty-one".