12768647421 has 16 divisors (see below), whose sum is σ = 17221710528. Its totient is φ = 8414515200.

The previous prime is 12768647407. The next prime is 12768647431. The reversal of 12768647421 is 12474686721.

It is not a de Polignac number, because 12768647421 - 2⁶ = 12768647357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12768647401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37791 + ... + 164211.

It is an arithmetic number, because the mean of its divisors is an integer number (1076356908).

Almost surely, 2^12768647421 is an apocalyptic number.

It is an amenable number.

12768647421 is a deficient number, since it is larger than the sum of its proper divisors (4453063107).

12768647421 is a wasteful number, since it uses less digits than its factorization.

12768647421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126812.

The product of its digits is 903168, while the sum is 48.

The spelling of 12768647421 in words is "twelve billion, seven hundred sixty-eight million, six hundred forty-seven thousand, four hundred twenty-one".