12261187228 has 24 divisors (see below), whose sum is σ = 21919464000. Its totient is φ = 5998553088.

The previous prime is 12261187223. The next prime is 12261187249. The reversal of 12261187228 is 82278116221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261187223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018428 + ... + 1030396.

It is an arithmetic number, because the mean of its divisors is an integer number (913311000).

Almost surely, 2^12261187228 is an apocalyptic number.

It is an amenable number.

12261187228 is a deficient number, since it is larger than the sum of its proper divisors (9658276772).

12261187228 is a wasteful number, since it uses less digits than its factorization.

12261187228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17469 (or 17467 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The spelling of 12261187228 in words is "twelve billion, two hundred sixty-one million, one hundred eighty-seven thousand, two hundred twenty-eight".