12154121 has 4 divisors (see below), whose sum is σ = 13890432. Its totient is φ = 10417812.

The previous prime is 12154117. The next prime is 12154123. The reversal of 12154121 is 12145121.

12154121 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, and also an emirpimes, since its reverse is a distinct semiprime: 12145121 = 2207 ⋅5503.

It is a cyclic number.

It is not a de Polignac number, because 12154121 - 2² = 12154117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12154121.

It is not an unprimeable number, because it can be changed into a prime (12154123) 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, 868145 + ... + 868158.

It is an arithmetic number, because the mean of its divisors is an integer number (3472608).

Almost surely, 2^12154121 is an apocalyptic number.

It is an amenable number.

12154121 is a deficient number, since it is larger than the sum of its proper divisors (1736311).

12154121 is an equidigital number, since it uses as much as digits as its factorization.

12154121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736310.

The product of its digits is 80, while the sum is 17.

The square root of 12154121 is about 3486.2760934843. The cubic root of 12154121 is about 229.9188182300.

Adding to 12154121 its reverse (12145121), we get a palindrome (24299242).

The spelling of 12154121 in words is "twelve million, one hundred fifty-four thousand, one hundred twenty-one".