12721235677 has 8 divisors (see below), whose sum is σ = 13512040056. Its totient is φ = 11935153152.

The previous prime is 12721235641. The next prime is 12721235689. The reversal of 12721235677 is 77653212721.

It can be written as a sum of positive squares in 4 ways, for example, as 348232921 + 12373002756 = 18661^2 + 111234^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12721235677 - 2³¹ = 10573752029 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 (12721235077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174908 + ... + 1185685.

It is an arithmetic number, because the mean of its divisors is an integer number (1689005007).

Almost surely, 2^12721235677 is an apocalyptic number.

12721235677 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12721235677 is a deficient number, since it is larger than the sum of its proper divisors (790804379).

12721235677 is a wasteful number, since it uses less digits than its factorization.

12721235677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360927.

The product of its digits is 246960, while the sum is 43.

The spelling of 12721235677 in words is "twelve billion, seven hundred twenty-one million, two hundred thirty-five thousand, six hundred seventy-seven".