853816421 has 4 divisors (see below), whose sum is σ = 854077452. Its totient is φ = 853555392.

The previous prime is 853816343. The next prime is 853816423. The reversal of 853816421 is 124618358.

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 813048196 + 40768225 = 28514^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 853816421 - 2¹⁴ = 853800037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853816423) 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, 125546 + ... + 132171.

It is an arithmetic number, because the mean of its divisors is an integer number (213519363).

Almost surely, 2^853816421 is an apocalyptic number.

It is an amenable number.

853816421 is a deficient number, since it is larger than the sum of its proper divisors (261031).

853816421 is a wasteful number, since it uses less digits than its factorization.

853816421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261030.

The product of its digits is 46080, while the sum is 38.

The square root of 853816421 is about 29220.1372515599. The cubic root of 853816421 is about 948.6838361074.

The spelling of 853816421 in words is "eight hundred fifty-three million, eight hundred sixteen thousand, four hundred twenty-one".