853621044421 has 4 divisors (see below), whose sum is σ = 903834047052. Its totient is φ = 803408041792.

The previous prime is 853621044371. The next prime is 853621044487. The reversal of 853621044421 is 124440126358.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124440126358 = 2 ⋅62220063179.

It can be written as a sum of positive squares in 2 ways, for example, as 534966439396 + 318654605025 = 731414^2 + 564495^2 .

It is not a de Polignac number, because 853621044421 - 2¹⁹ = 853620520133 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 (853621044491) 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, 25106501290 + ... + 25106501323.

It is an arithmetic number, because the mean of its divisors is an integer number (225958511763).

Almost surely, 2^853621044421 is an apocalyptic number.

It is an amenable number.

853621044421 is a deficient number, since it is larger than the sum of its proper divisors (50213002631).

853621044421 is a wasteful number, since it uses less digits than its factorization.

853621044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50213002630.

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 853621044421 in words is "eight hundred fifty-three billion, six hundred twenty-one million, forty-four thousand, four hundred twenty-one".