9213421 has 6 divisors (see below), whose sum is σ = 10717710. Its totient is φ = 7897176.

The previous prime is 9213419. The next prime is 9213431. The reversal of 9213421 is 1243129.

9213421 = T₂₇₈ + T₂₇₉ + ... + T₄₂₄.

9213421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4862025 + 4351396 = 2205^2 + 2086^2 .

It is not a de Polignac number, because 9213421 - 2¹ = 9213419 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9213392 and 9213401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9213401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93966 + ... + 94063.

It is an arithmetic number, because the mean of its divisors is an integer number (1786285).

Almost surely, 2^9213421 is an apocalyptic number.

It is an amenable number.

9213421 is a deficient number, since it is larger than the sum of its proper divisors (1504289).

9213421 is a wasteful number, since it uses less digits than its factorization.

9213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188043 (or 188036 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 9213421 is about 3035.3617576823. The cubic root of 9213421 is about 209.6397527328.

The spelling of 9213421 in words is "nine million, two hundred thirteen thousand, four hundred twenty-one".