9213621 has 4 divisors (see below), whose sum is σ = 12284832. Its totient is φ = 6142412.

The previous prime is 9213601. The next prime is 9213637. The reversal of 9213621 is 1263129.

9213621 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9213621 - 2¹³ = 9205429 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9213591 and 9213600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9213601) 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, 1535601 + ... + 1535606.

It is an arithmetic number, because the mean of its divisors is an integer number (3071208).

Almost surely, 2^9213621 is an apocalyptic number.

It is an amenable number.

9213621 is a deficient number, since it is larger than the sum of its proper divisors (3071211).

9213621 is a wasteful number, since it uses less digits than its factorization.

9213621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071210.

The product of its digits is 648, while the sum is 24.

The square root of 9213621 is about 3035.3947025058. The cubic root of 9213621 is about 209.6412696376.

The spelling of 9213621 in words is "nine million, two hundred thirteen thousand, six hundred twenty-one".