15213213 has 6 divisors (see below), whose sum is σ = 21974654. Its totient is φ = 10142136.

The previous prime is 15213169. The next prime is 15213227. The reversal of 15213213 is 31231251.

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 1397124 = 3717^2 + 1182^2 .

It is not a de Polignac number, because 15213213 - 2¹⁷ = 15082141 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 (15213613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 845170 + ... + 845187.

Almost surely, 2^15213213 is an apocalyptic number.

It is an amenable number.

15213213 is a deficient number, since it is larger than the sum of its proper divisors (6761441).

15213213 is a wasteful number, since it uses less digits than its factorization.

15213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690363 (or 1690360 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 15213213 is about 3900.4119013253. The cubic root of 15213213 is about 247.7842219980.

Adding to 15213213 its reverse (31231251), we get a palindrome (46444464).

The spelling of 15213213 in words is "fifteen million, two hundred thirteen thousand, two hundred thirteen".