1216671213 has 16 divisors (see below), whose sum is σ = 1723576320. Its totient is φ = 761238576.

The previous prime is 1216671163. The next prime is 1216671223. The reversal of 1216671213 is 3121766121.

1216671213 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1216671213 - 2²⁴ = 1199893997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216671223) 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, 93645 + ... + 105842.

It is an arithmetic number, because the mean of its divisors is an integer number (107723520).

Almost surely, 2^1216671213 is an apocalyptic number.

It is an amenable number.

1216671213 is a deficient number, since it is larger than the sum of its proper divisors (506905107).

1216671213 is a wasteful number, since it uses less digits than its factorization.

1216671213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199616.

The product of its digits is 3024, while the sum is 30.

The square root of 1216671213 is about 34880.8143970292. The cubic root of 1216671213 is about 1067.5570121675.

The spelling of 1216671213 in words is "one billion, two hundred sixteen million, six hundred seventy-one thousand, two hundred thirteen".