11211305 has 16 divisors (see below), whose sum is σ = 15873024. Its totient is φ = 7439040.

The previous prime is 11211293. The next prime is 11211331. The reversal of 11211305 is 50311211.

It is not a de Polignac number, because 11211305 - 2⁴ = 11211289 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 11211305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4082 + ... + 6251.

It is an arithmetic number, because the mean of its divisors is an integer number (992064).

Almost surely, 2^11211305 is an apocalyptic number.

It is an amenable number.

11211305 is a deficient number, since it is larger than the sum of its proper divisors (4661719).

11211305 is a wasteful number, since it uses less digits than its factorization.

11211305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10376.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 11211305 is about 3348.3286875694. The cubic root of 11211305 is about 223.8130415458.

Adding to 11211305 its reverse (50311211), we get a palindrome (61522516).

It can be divided in two parts, 1121 and 1305, that multiplied together give a triangular number (1462905 = T₁₇₁₀).

The spelling of 11211305 in words is "eleven million, two hundred eleven thousand, three hundred five".