12421154 has 4 divisors (see below), whose sum is σ = 18631734. Its totient is φ = 6210576.

The previous prime is 12421121. The next prime is 12421163. The reversal of 12421154 is 45112421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45112421 = 383 ⋅117787.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 1760929 = 3265^2 + 1327^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3105287 + ... + 3105290.

Almost surely, 2^12421154 is an apocalyptic number.

12421154 is a deficient number, since it is larger than the sum of its proper divisors (6210580).

12421154 is an equidigital number, since it uses as much as digits as its factorization.

12421154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210579.

The product of its digits is 320, while the sum is 20.

The square root of 12421154 is about 3524.3657585444. The cubic root of 12421154 is about 231.5904511521.

Adding to 12421154 its reverse (45112421), we get a palindrome (57533575).

The spelling of 12421154 in words is "twelve million, four hundred twenty-one thousand, one hundred fifty-four".