13212705 has 16 divisors (see below), whose sum is σ = 23062464. Its totient is φ = 6406080.

The previous prime is 13212697. The next prime is 13212707. The reversal of 13212705 is 50721231.

It is not a de Polignac number, because 13212705 - 2³ = 13212697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13212707) 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, 39874 + ... + 40203.

It is an arithmetic number, because the mean of its divisors is an integer number (1441404).

Almost surely, 2^13212705 is an apocalyptic number.

13212705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13212705 is a deficient number, since it is larger than the sum of its proper divisors (9849759).

13212705 is a wasteful number, since it uses less digits than its factorization.

13212705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80096.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 13212705 is about 3634.9284724737. The cubic root of 13212705 is about 236.4089493321.

Adding to 13212705 its reverse (50721231), we get a palindrome (63933936).

The spelling of 13212705 in words is "thirteen million, two hundred twelve thousand, seven hundred five".