12539898421 has 16 divisors (see below), whose sum is σ = 13283621568. Its totient is φ = 11823926400.

The previous prime is 12539898383. The next prime is 12539898457. The reversal of 12539898421 is 12489893521.

It is a cyclic number.

It is not a de Polignac number, because 12539898421 - 2¹⁷ = 12539767349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12539898221) 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, 102526 + ... + 188656.

It is an arithmetic number, because the mean of its divisors is an integer number (830226348).

Almost surely, 2^12539898421 is an apocalyptic number.

It is an amenable number.

12539898421 is a deficient number, since it is larger than the sum of its proper divisors (743723147).

12539898421 is an equidigital number, since it uses as much as digits as its factorization.

12539898421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86292.

The product of its digits is 1244160, while the sum is 52.

The spelling of 12539898421 in words is "twelve billion, five hundred thirty-nine million, eight hundred ninety-eight thousand, four hundred twenty-one".