12721235623 has 32 divisors (see below), whose sum is σ = 14500362240. Its totient is φ = 11099151360.

The previous prime is 12721235591. The next prime is 12721235641. The reversal of 12721235623 is 32653212721.

It is a cyclic number.

It is not a de Polignac number, because 12721235623 - 2⁵ = 12721235591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721235693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1564338 + ... + 1572448.

It is an arithmetic number, because the mean of its divisors is an integer number (453136320).

Almost surely, 2^12721235623 is an apocalyptic number.

12721235623 is a deficient number, since it is larger than the sum of its proper divisors (1779126617).

12721235623 is a wasteful number, since it uses less digits than its factorization.

12721235623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8287.

The product of its digits is 30240, while the sum is 34.

The spelling of 12721235623 in words is "twelve billion, seven hundred twenty-one million, two hundred thirty-five thousand, six hundred twenty-three".