1216241236 has 12 divisors (see below), whose sum is σ = 2432482528. Its totient is φ = 521246232.

The previous prime is 1216241227. The next prime is 1216241239. The reversal of 1216241236 is 6321426121.

1216241236 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 43437187 = 1216241236 / (1 + 2 + 1 + 6 + 2 + 4 + 1 + 2 + 3 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216241239) 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, 21718566 + ... + 21718621.

Almost surely, 2^1216241236 is an apocalyptic number.

It is an amenable number.

1216241236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216241236 is a wasteful number, since it uses less digits than its factorization.

1216241236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43437198 (or 43437196 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 1216241236 is about 34874.6503351647. The cubic root of 1216241236 is about 1067.4312375564.

Adding to 1216241236 its reverse (6321426121), we get a palindrome (7537667357).

The spelling of 1216241236 in words is "one billion, two hundred sixteen million, two hundred forty-one thousand, two hundred thirty-six".