1216316213 has 4 divisors (see below), whose sum is σ = 1390075680. Its totient is φ = 1042556748.

The previous prime is 1216316197. The next prime is 1216316237. The reversal of 1216316213 is 3126136121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216316213 - 2⁴ = 1216316197 is a prime.

It is a super-2 number, since 2×1216316213² = 2958850260013322738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216316263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86879723 + ... + 86879736.

It is an arithmetic number, because the mean of its divisors is an integer number (347518920).

Almost surely, 2^1216316213 is an apocalyptic number.

It is an amenable number.

1216316213 is a deficient number, since it is larger than the sum of its proper divisors (173759467).

1216316213 is an equidigital number, since it uses as much as digits as its factorization.

1216316213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173759466.

The product of its digits is 1296, while the sum is 26.

The square root of 1216316213 is about 34875.7252684442. The cubic root of 1216316213 is about 1067.4531715678.

The spelling of 1216316213 in words is "one billion, two hundred sixteen million, three hundred sixteen thousand, two hundred thirteen".