12498729921 has 16 divisors (see below), whose sum is σ = 18536822400. Its totient is φ = 8323403184.

The previous prime is 12498729913. The next prime is 12498729941. The reversal of 12498729921 is 12992789421.

It is a happy number.

It is not a de Polignac number, because 12498729921 - 2³ = 12498729913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12498729941) 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, 227046 + ... + 276671.

It is an arithmetic number, because the mean of its divisors is an integer number (1158551400).

Almost surely, 2^12498729921 is an apocalyptic number.

It is an amenable number.

12498729921 is a deficient number, since it is larger than the sum of its proper divisors (6038092479).

12498729921 is an equidigital number, since it uses as much as digits as its factorization.

12498729921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504645 (or 504639 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The spelling of 12498729921 in words is "twelve billion, four hundred ninety-eight million, seven hundred twenty-nine thousand, nine hundred twenty-one".