12750205721 has 24 divisors (see below), whose sum is σ = 14765617440. Its totient is φ = 10971132480.

The previous prime is 12750205691. The next prime is 12750205753.

12750205721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12750205721 - 2²² = 12746011417 is a prime.

It is a super-2 number, since 2×12750205721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12750205781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3807770 + ... + 3811116.

It is an arithmetic number, because the mean of its divisors is an integer number (615234060).

Almost surely, 2^12750205721 is an apocalyptic number.

12750205721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12750205721 is a deficient number, since it is larger than the sum of its proper divisors (2015411719).

12750205721 is a wasteful number, since it uses less digits than its factorization.

12750205721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045 (or 5034 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 12750205721 in words is "twelve billion, seven hundred fifty million, two hundred five thousand, seven hundred twenty-one".