12693650821 has 4 divisors (see below), whose sum is σ = 12716857312. Its totient is φ = 12670444332.

The previous prime is 12693650759. The next prime is 12693650839. The reversal of 12693650821 is 12805639621.

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 not a de Polignac number, because 12693650821 - 2⁹ = 12693650309 is a prime.

It is a super-2 number, since 2×12693650821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12693650861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11602425 + ... + 11603518.

It is an arithmetic number, because the mean of its divisors is an integer number (3179214328).

Almost surely, 2^12693650821 is an apocalyptic number.

It is an amenable number.

12693650821 is a deficient number, since it is larger than the sum of its proper divisors (23206491).

12693650821 is an equidigital number, since it uses as much as digits as its factorization.

12693650821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23206490.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 12693650821 in words is "twelve billion, six hundred ninety-three million, six hundred fifty thousand, eight hundred twenty-one".