11211818 has 4 divisors (see below), whose sum is σ = 16817730. Its totient is φ = 5605908.

The previous prime is 11211799. The next prime is 11211821. The reversal of 11211818 is 81811211.

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

It can be written as a sum of positive squares in only one way, i.e., 11202409 + 9409 = 3347^2 + 97^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11211793 and 11211802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802953 + ... + 2802956.

Almost surely, 2^11211818 is an apocalyptic number.

11211818 is a deficient number, since it is larger than the sum of its proper divisors (5605912).

11211818 is an equidigital number, since it uses as much as digits as its factorization.

11211818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605911.

The product of its digits is 128, while the sum is 23.

The square root of 11211818 is about 3348.4052920756. The cubic root of 11211818 is about 223.8164551936.

The spelling of 11211818 in words is "eleven million, two hundred eleven thousand, eight hundred eighteen".