12153421 has 12 divisors (see below), whose sum is σ = 14288988. Its totient is φ = 10305792.

The previous prime is 12153397. The next prime is 12153451. The reversal of 12153421 is 12435121.

It can be written as a sum of positive squares in 2 ways, for example, as 5336100 + 6817321 = 2310^2 + 2611^2 .

It is not a de Polignac number, because 12153421 - 2¹⁹ = 11629133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12153451) 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 11 ways as a sum of consecutive naturals, for example, 3475 + ... + 6031.

It is an arithmetic number, because the mean of its divisors is an integer number (1190749).

Almost surely, 2^12153421 is an apocalyptic number.

It is an amenable number.

12153421 is a deficient number, since it is larger than the sum of its proper divisors (2135567).

12153421 is an equidigital number, since it uses as much as digits as its factorization.

12153421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668 (or 2661 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 12153421 is about 3486.1756983835. The cubic root of 12153421 is about 229.9144041918.

Adding to 12153421 its reverse (12435121), we get a palindrome (24588542).

The spelling of 12153421 in words is "twelve million, one hundred fifty-three thousand, four hundred twenty-one".