12489662621 has 4 divisors (see below), whose sum is σ = 12492401952. Its totient is φ = 12486923292.

The previous prime is 12489662593. The next prime is 12489662639. The reversal of 12489662621 is 12626698421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12489662621 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 (12489662681) 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, 1362815 + ... + 1371948.

It is an arithmetic number, because the mean of its divisors is an integer number (3123100488).

Almost surely, 2^12489662621 is an apocalyptic number.

It is an amenable number.

12489662621 is a deficient number, since it is larger than the sum of its proper divisors (2739331).

12489662621 is an equidigital number, since it uses as much as digits as its factorization.

12489662621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739330.

The product of its digits is 497664, while the sum is 47.

The spelling of 12489662621 in words is "twelve billion, four hundred eighty-nine million, six hundred sixty-two thousand, six hundred twenty-one".