12211387 has 2 divisors, whose sum is σ = 12211388. Its totient is φ = 12211386.

The previous prime is 12211373. The next prime is 12211391. The reversal of 12211387 is 78311221.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78311221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12211387 - 2⁷ = 12211259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12211307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105693 + 6105694.

It is an arithmetic number, because the mean of its divisors is an integer number (6105694).

Almost surely, 2^12211387 is an apocalyptic number.

12211387 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211387 is an equidigital number, since it uses as much as digits as its factorization.

12211387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 25.

The square root of 12211387 is about 3494.4795034454. The cubic root of 12211387 is about 230.2793518108.

The spelling of 12211387 in words is "twelve million, two hundred eleven thousand, three hundred eighty-seven".