11221811 has 8 divisors (see below), whose sum is σ = 11650800. Its totient is φ = 10795680.

The previous prime is 11221789. The next prime is 11221829. The reversal of 11221811 is 11812211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11221811 - 2¹⁸ = 10959667 is a prime.

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 11221811.

It is not an unprimeable number, because it can be changed into a prime (11221891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10481 + ... + 11501.

It is an arithmetic number, because the mean of its divisors is an integer number (1456350).

Almost surely, 2^11221811 is an apocalyptic number.

11221811 is a deficient number, since it is larger than the sum of its proper divisors (428989).

11221811 is a wasteful number, since it uses less digits than its factorization.

11221811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429.

The product of its digits is 32, while the sum is 17.

The square root of 11221811 is about 3349.8971626007. The cubic root of 11221811 is about 223.8829306953.

The spelling of 11221811 in words is "eleven million, two hundred twenty-one thousand, eight hundred eleven".