12121427 has 2 divisors, whose sum is σ = 12121428. Its totient is φ = 12121426.

The previous prime is 12121423. The next prime is 12121451. The reversal of 12121427 is 72412121.

It is a weak prime.

It is an emirp because it is prime and its reverse (72412121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12121427 - 2² = 12121423 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121399 and 12121408.

It is not a weakly prime, because it can be changed into another prime (12121423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060713 + 6060714.

It is an arithmetic number, because the mean of its divisors is an integer number (6060714).

Almost surely, 2^12121427 is an apocalyptic number.

12121427 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121427 is an equidigital number, since it uses as much as digits as its factorization.

12121427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 20.

The square root of 12121427 is about 3481.5839785937. The cubic root of 12121427 is about 229.7124762542.

Adding to 12121427 its reverse (72412121), we get a palindrome (84533548).

The spelling of 12121427 in words is "twelve million, one hundred twenty-one thousand, four hundred twenty-seven".