216216136 has 16 divisors (see below), whose sum is σ = 406035900. Its totient is φ = 107939904.

The previous prime is 216216113. The next prime is 216216137. The reversal of 216216136 is 631612612.

It can be written as a sum of positive squares in 2 ways, for example, as 215913636 + 302500 = 14694^2 + 550^2 .

It is not an unprimeable number, because it can be changed into a prime (216216137) 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, 15471 + ... + 25918.

Almost surely, 2^216216136 is an apocalyptic number.

It is an amenable number.

216216136 is a deficient number, since it is larger than the sum of its proper divisors (189819764).

216216136 is a wasteful number, since it uses less digits than its factorization.

216216136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42048 (or 42044 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 216216136 is about 14704.2897142297. The cubic root of 216216136 is about 600.2000592124.

Adding to 216216136 its reverse (631612612), we get a palindrome (847828748).

The spelling of 216216136 in words is "two hundred sixteen million, two hundred sixteen thousand, one hundred thirty-six".