13121205 has 16 divisors (see below), whose sum is σ = 21048000. Its totient is φ = 6979968.

The previous prime is 13121203. The next prime is 13121209. The reversal of 13121205 is 50212131.

13121205 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13121205 - 2¹ = 13121203 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121203) 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, 6609 + ... + 8361.

It is an arithmetic number, because the mean of its divisors is an integer number (1315500).

Almost surely, 2^13121205 is an apocalyptic number.

13121205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13121205 is a deficient number, since it is larger than the sum of its proper divisors (7926795).

13121205 is a wasteful number, since it uses less digits than its factorization.

13121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260.

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

The square root of 13121205 is about 3622.3203889220. The cubic root of 13121205 is about 235.8619620323.

Adding to 13121205 its reverse (50212131), we get a palindrome (63333336).

The spelling of 13121205 in words is "thirteen million, one hundred twenty-one thousand, two hundred five".