13212105 has 16 divisors (see below), whose sum is σ = 21539520. Its totient is φ = 6913088.

The previous prime is 13212103. The next prime is 13212109. The reversal of 13212105 is 50121231.

13212105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13212105 - 2¹ = 13212103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (13212103) 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, 7515 + ... + 9104.

It is an arithmetic number, because the mean of its divisors is an integer number (1346220).

Almost surely, 2^13212105 is an apocalyptic number.

13212105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13212105 is a deficient number, since it is larger than the sum of its proper divisors (8327415).

13212105 is a wasteful number, since it uses less digits than its factorization.

13212105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16680.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 13212105 is about 3634.8459389636. The cubic root of 13212105 is about 236.4053707685.

Adding to 13212105 its reverse (50121231), we get a palindrome (63333336).

The spelling of 13212105 in words is "thirteen million, two hundred twelve thousand, one hundred five".