18211099 has 2 divisors, whose sum is σ = 18211100. Its totient is φ = 18211098.

The previous prime is 18211073. The next prime is 18211103. The reversal of 18211099 is 99011281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18211099 - 2⁷ = 18210971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18211099.

It is not a weakly prime, because it can be changed into another prime (18211019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9105549 + 9105550.

It is an arithmetic number, because the mean of its divisors is an integer number (9105550).

Almost surely, 2^18211099 is an apocalyptic number.

18211099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18211099 is an equidigital number, since it uses as much as digits as its factorization.

18211099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 18211099 is about 4267.4464261429. The cubic root of 18211099 is about 263.0946711563.

The spelling of 18211099 in words is "eighteen million, two hundred eleven thousand, ninety-nine".