9813513421 has 4 divisors (see below), whose sum is σ = 9814767772. Its totient is φ = 9812259072.

The previous prime is 9813513407. The next prime is 9813513497. The reversal of 9813513421 is 1243153189.

9813513421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243153189 = 131 ⋅9489719.

It can be written as a sum of positive squares in 2 ways, for example, as 3491037225 + 6322476196 = 59085^2 + 79514^2 .

It is a cyclic number.

It is not a de Polignac number, because 9813513421 - 2²⁵ = 9779958989 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 (9813813421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615366 + ... + 631111.

It is an arithmetic number, because the mean of its divisors is an integer number (2453691943).

Almost surely, 2^9813513421 is an apocalyptic number.

It is an amenable number.

9813513421 is a deficient number, since it is larger than the sum of its proper divisors (1254351).

9813513421 is a wasteful number, since it uses less digits than its factorization.

9813513421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254350.

The product of its digits is 25920, while the sum is 37.

The square root of 9813513421 is about 99063.1789364747. The cubic root of 9813513421 is about 2140.9581278207.

It can be divided in two parts, 98135 and 13421, that added together give a square (111556 = 334²).

The spelling of 9813513421 in words is "nine billion, eight hundred thirteen million, five hundred thirteen thousand, four hundred twenty-one".