18212135 has 4 divisors (see below), whose sum is σ = 21854568. Its totient is φ = 14569704.

The previous prime is 18212123. The next prime is 18212143. The reversal of 18212135 is 53121281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18212135 - 2⁴ = 18212119 is a prime.

It is a super-2 number, since 2×18212135² = 663363722516450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18212135.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821209 + ... + 1821218.

It is an arithmetic number, because the mean of its divisors is an integer number (5463642).

Almost surely, 2^18212135 is an apocalyptic number.

18212135 is a deficient number, since it is larger than the sum of its proper divisors (3642433).

18212135 is an equidigital number, since it uses as much as digits as its factorization.

18212135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642432.

The product of its digits is 480, while the sum is 23.

The square root of 18212135 is about 4267.5678084830. The cubic root of 18212135 is about 263.0996600720.

It can be divided in two parts, 182121 and 35, that multiplied together give a triangular number (6374235 = T₃₅₇₀).

The spelling of 18212135 in words is "eighteen million, two hundred twelve thousand, one hundred thirty-five".