13121213 has 16 divisors (see below), whose sum is σ = 15425664. Its totient is φ = 10929600.

The previous prime is 13121209. The next prime is 13121219. The reversal of 13121213 is 31212131.

It is a cyclic number.

It is not a de Polignac number, because 13121213 - 2² = 13121209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47231 + ... + 47507.

It is an arithmetic number, because the mean of its divisors is an integer number (964104).

Almost surely, 2^13121213 is an apocalyptic number.

It is an amenable number.

13121213 is a deficient number, since it is larger than the sum of its proper divisors (2304451).

13121213 is a wasteful number, since it uses less digits than its factorization.

13121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 36, while the sum is 14.

The square root of 13121213 is about 3622.3214931864. The cubic root of 13121213 is about 235.8620099673.

Adding to 13121213 its reverse (31212131), we get a palindrome (44333344).

It can be divided in two parts, 131 and 21213, that multiplied together give a triangular number (2778903 = T₂₃₅₇).

The spelling of 13121213 in words is "thirteen million, one hundred twenty-one thousand, two hundred thirteen".