12635621043 has 4 divisors (see below), whose sum is σ = 16847494728. Its totient is φ = 8423747360.

The previous prime is 12635621023. The next prime is 12635621081. The reversal of 12635621043 is 34012653621.

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 12635621043 - 2¹⁴ = 12635604659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12635620995 and 12635621013.

It is not an unprimeable number, because it can be changed into a prime (12635621023) 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, 2105936838 + ... + 2105936843.

It is an arithmetic number, because the mean of its divisors is an integer number (4211873682).

Almost surely, 2^12635621043 is an apocalyptic number.

12635621043 is a deficient number, since it is larger than the sum of its proper divisors (4211873685).

12635621043 is an equidigital number, since it uses as much as digits as its factorization.

12635621043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211873684.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 12635621043 in words is "twelve billion, six hundred thirty-five million, six hundred twenty-one thousand, forty-three".