12115421 has 2 divisors, whose sum is σ = 12115422. Its totient is φ = 12115420.

The previous prime is 12115399. The next prime is 12115463. The reversal of 12115421 is 12451121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 136900 = 3461^2 + 370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12115421 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12115421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12115471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6057710 + 6057711.

It is an arithmetic number, because the mean of its divisors is an integer number (6057711).

Almost surely, 2^12115421 is an apocalyptic number.

It is an amenable number.

12115421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115421 is an equidigital number, since it uses as much as digits as its factorization.

12115421 is an evil number, because the sum of its binary digits is even.

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

The square root of 12115421 is about 3480.7213332871. The cubic root of 12115421 is about 229.6745301977.

Adding to 12115421 its reverse (12451121), we get a palindrome (24566542).

The spelling of 12115421 in words is "twelve million, one hundred fifteen thousand, four hundred twenty-one".