12281212136 has 8 divisors (see below), whose sum is σ = 23027272770. Its totient is φ = 6140606064.

The previous prime is 12281212133. The next prime is 12281212157. The reversal of 12281212136 is 63121218221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11848322500 + 432889636 = 108850^2 + 20806^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 12281212099 and 12281212108.

It is not an unprimeable number, because it can be changed into a prime (12281212133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 767575751 + ... + 767575766.

Almost surely, 2^12281212136 is an apocalyptic number.

It is an amenable number.

12281212136 is a deficient number, since it is larger than the sum of its proper divisors (10746060634).

12281212136 is a wasteful number, since it uses less digits than its factorization.

12281212136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535151523 (or 1535151519 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The spelling of 12281212136 in words is "twelve billion, two hundred eighty-one million, two hundred twelve thousand, one hundred thirty-six".