1215131224 has 16 divisors (see below), whose sum is σ = 2315722320. Its totient is φ = 597605280.

The previous prime is 1215131221. The next prime is 1215131243. The reversal of 1215131224 is 4221315121.

It is a junction number, because it is equal to n+sod(n) for n = 1215131195 and 1215131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215131221) 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, 1244524 + ... + 1245499.

It is an arithmetic number, because the mean of its divisors is an integer number (144732645).

Almost surely, 2^1215131224 is an apocalyptic number.

It is an amenable number.

1215131224 is a deficient number, since it is larger than the sum of its proper divisors (1100591096).

1215131224 is a wasteful number, since it uses less digits than its factorization.

1215131224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490090 (or 2490086 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 1215131224 is about 34858.7323923289. The cubic root of 1215131224 is about 1067.1064055828.

Adding to 1215131224 its reverse (4221315121), we get a palindrome (5436446345).

The spelling of 1215131224 in words is "one billion, two hundred fifteen million, one hundred thirty-one thousand, two hundred twenty-four".