12131221403 has 48 divisors (see below), whose sum is σ = 15886173600. Its totient is φ = 9178444800.

The previous prime is 12131221387. The next prime is 12131221411. The reversal of 12131221403 is 30412213121.

It is not a de Polignac number, because 12131221403 - 2⁴ = 12131221387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12131221423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1594733 + ... + 1602321.

It is an arithmetic number, because the mean of its divisors is an integer number (330961950).

Almost surely, 2^12131221403 is an apocalyptic number.

12131221403 is a deficient number, since it is larger than the sum of its proper divisors (3754952197).

12131221403 is a wasteful number, since it uses less digits than its factorization.

12131221403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740 (or 7733 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 12131221403 its reverse (30412213121), we get a palindrome (42543434524).

The spelling of 12131221403 in words is "twelve billion, one hundred thirty-one million, two hundred twenty-one thousand, four hundred three".