12192921 has 36 divisors (see below), whose sum is σ = 19927908. Its totient is φ = 7140672.

The previous prime is 12192919. The next prime is 12192923. The reversal of 12192921 is 12929121.

It is an interprime number because it is at equal distance from previous prime (12192919) and next prime (12192923).

It can be written as a sum of positive squares in 2 ways, for example, as 7617600 + 4575321 = 2760^2 + 2139^2 .

It is not a de Polignac number, because 12192921 - 2¹ = 12192919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12192923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 61795 + ... + 61991.

It is an arithmetic number, because the mean of its divisors is an integer number (553553).

Almost surely, 2^12192921 is an apocalyptic number.

It is an amenable number.

12192921 is a deficient number, since it is larger than the sum of its proper divisors (7734987).

12192921 is a wasteful number, since it uses less digits than its factorization.

12192921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 236 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 12192921 is about 3491.8363363709. The cubic root of 12192921 is about 230.1632174801.

The spelling of 12192921 in words is "twelve million, one hundred ninety-two thousand, nine hundred twenty-one".