18212371 has 2 divisors, whose sum is σ = 18212372. Its totient is φ = 18212370.

The previous prime is 18212353. The next prime is 18212387. The reversal of 18212371 is 17321281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18212371 - 2⁹ = 18211859 is a prime.

It is not a weakly prime, because it can be changed into another prime (18212071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106185 + 9106186.

It is an arithmetic number, because the mean of its divisors is an integer number (9106186).

Almost surely, 2^18212371 is an apocalyptic number.

18212371 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212371 is an equidigital number, since it uses as much as digits as its factorization.

18212371 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 18212371 is about 4267.5954588035. The cubic root of 18212371 is about 263.1007965167.

It can be divided in two parts, 182 and 12371, that multiplied together give a palindrome (2251522).

The spelling of 18212371 in words is "eighteen million, two hundred twelve thousand, three hundred seventy-one".