12221222136 has 64 divisors (see below), whose sum is σ = 31006800000. Its totient is φ = 4013663616.

The previous prime is 12221222131. The next prime is 12221222159. The reversal of 12221222136 is 63122212221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221222131) 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, 455215 + ... + 481313.

It is an arithmetic number, because the mean of its divisors is an integer number (484481250).

Almost surely, 2^12221222136 is an apocalyptic number.

It is an amenable number.

12221222136 is an abundant number, since it is smaller than the sum of its proper divisors (18785577864).

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

12221222136 is a wasteful number, since it uses less digits than its factorization.

12221222136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26396 (or 26392 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 12221222136 its reverse (63122212221), we get a palindrome (75343434357).

The spelling of 12221222136 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred thirty-six".