11212005 has 16 divisors (see below), whose sum is σ = 20502144. Its totient is φ = 5125440.

The previous prime is 11212001. The next prime is 11212013. The reversal of 11212005 is 50021211.

11212005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11212005 - 2² = 11212001 is a prime.

It is a super-2 number, since 2×11212005² = 251418112240050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53286 + ... + 53495.

It is an arithmetic number, because the mean of its divisors is an integer number (1281384).

Almost surely, 2^11212005 is an apocalyptic number.

11212005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11212005 is a deficient number, since it is larger than the sum of its proper divisors (9290139).

11212005 is a wasteful number, since it uses less digits than its factorization.

11212005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106796.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 11212005 is about 3348.4332156995. The cubic root of 11212005 is about 223.8176995188.

Adding to 11212005 its reverse (50021211), we get a palindrome (61233216).

The spelling of 11212005 in words is "eleven million, two hundred twelve thousand, five".