12193921 has 4 divisors (see below), whose sum is σ = 12208644. Its totient is φ = 12179200.

The previous prime is 12193919. The next prime is 12193931. The reversal of 12193921 is 12939121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 9235521 = 1720^2 + 3039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12193921 - 2¹ = 12193919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12193921.

It is not an unprimeable number, because it can be changed into a prime (12193931) 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, 6040 + ... + 7801.

It is an arithmetic number, because the mean of its divisors is an integer number (3052161).

Almost surely, 2^12193921 is an apocalyptic number.

It is an amenable number.

12193921 is a deficient number, since it is larger than the sum of its proper divisors (14723).

12193921 is an equidigital number, since it uses as much as digits as its factorization.

12193921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14722.

The product of its digits is 972, while the sum is 28.

The square root of 12193921 is about 3491.9795245677. The cubic root of 12193921 is about 230.1695095716.

The spelling of 12193921 in words is "twelve million, one hundred ninety-three thousand, nine hundred twenty-one".