11213811 has 48 divisors (see below), whose sum is σ = 19768320. Its totient is φ = 5987520.

The previous prime is 11213809. The next prime is 11213821. The reversal of 11213811 is 11831211.

It is a happy number.

It is not a de Polignac number, because 11213811 - 2¹ = 11213809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102825 + ... + 102933.

It is an arithmetic number, because the mean of its divisors is an integer number (411840).

Almost surely, 2^11213811 is an apocalyptic number.

11213811 is a deficient number, since it is larger than the sum of its proper divisors (8554509).

11213811 is a wasteful number, since it uses less digits than its factorization.

11213811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 213 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 11213811 is about 3348.7028832072. The cubic root of 11213811 is about 223.8297161939.

The spelling of 11213811 in words is "eleven million, two hundred thirteen thousand, eight hundred eleven".