9811421 has 4 divisors (see below), whose sum is σ = 9818844. Its totient is φ = 9804000.

The previous prime is 9811393. The next prime is 9811427. The reversal of 9811421 is 1241189.

9811421 is digitally balanced in base 3, 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1241189 = 101 ⋅12289.

It can be written as a sum of positive squares in 2 ways, for example, as 7812025 + 1999396 = 2795^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 9811421 - 2¹⁸ = 9549277 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 (9811427) 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, 1130 + ... + 4571.

It is an arithmetic number, because the mean of its divisors is an integer number (2454711).

Almost surely, 2^9811421 is an apocalyptic number.

It is an amenable number.

9811421 is a deficient number, since it is larger than the sum of its proper divisors (7423).

9811421 is a wasteful number, since it uses less digits than its factorization.

9811421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7422.

The product of its digits is 576, while the sum is 26.

The square root of 9811421 is about 3132.3187896509. The cubic root of 9811421 is about 214.0805953162.

The spelling of 9811421 in words is "nine million, eight hundred eleven thousand, four hundred twenty-one".