12735253721 has 4 divisors (see below), whose sum is σ = 12861345444. Its totient is φ = 12609162000.

The previous prime is 12735253681. The next prime is 12735253723.

12735253721 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11037813721 + 1697440000 = 105061^2 + 41200^2 .

It is a cyclic number.

It is not a de Polignac number, because 12735253721 - 2¹⁴ = 12735237337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12735253723) 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, 63045710 + ... + 63045911.

It is an arithmetic number, because the mean of its divisors is an integer number (3215336361).

Almost surely, 2^12735253721 is an apocalyptic number.

It is an amenable number.

12735253721 is a deficient number, since it is larger than the sum of its proper divisors (126091723).

12735253721 is a wasteful number, since it uses less digits than its factorization.

12735253721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126091722.

The product of its digits is 88200, while the sum is 38.

The spelling of 12735253721 in words is "twelve billion, seven hundred thirty-five million, two hundred fifty-three thousand, seven hundred twenty-one".