12621735643499 has 4 divisors (see below), whose sum is σ = 12623906943936. Its totient is φ = 12619564343064.

The previous prime is 12621735643457. The next prime is 12621735643513. The reversal of 12621735643499 is 99434653712621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12621735643499 - 2⁴⁰ = 11522224015723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12621735633499) 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, 1085641499 + ... + 1085653124.

It is an arithmetic number, because the mean of its divisors is an integer number (3155976735984).

Almost surely, 2^{12621735643499} is an apocalyptic number.

12621735643499 is a deficient number, since it is larger than the sum of its proper divisors (2171300437).

12621735643499 is an equidigital number, since it uses as much as digits as its factorization.

12621735643499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171300436.

The product of its digits is 58786560, while the sum is 62.

The spelling of 12621735643499 in words is "twelve trillion, six hundred twenty-one billion, seven hundred thirty-five million, six hundred forty-three thousand, four hundred ninety-nine".