11615213213 has 2 divisors, whose sum is σ = 11615213214. Its totient is φ = 11615213212.

The previous prime is 11615213189. The next prime is 11615213221. The reversal of 11615213213 is 31231251611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8708062489 + 2907150724 = 93317^2 + 53918^2 .

It is a cyclic number.

It is not a de Polignac number, because 11615213213 - 2⁶ = 11615213149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11615213243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5807606606 + 5807606607.

It is an arithmetic number, because the mean of its divisors is an integer number (5807606607).

Almost surely, 2^11615213213 is an apocalyptic number.

It is an amenable number.

11615213213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11615213213 is an equidigital number, since it uses as much as digits as its factorization.

11615213213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

Adding to 11615213213 its reverse (31231251611), we get a palindrome (42846464824).

The spelling of 11615213213 in words is "eleven billion, six hundred fifteen million, two hundred thirteen thousand, two hundred thirteen".