12307461721 has 3 divisors (see below), whose sum is σ = 12307572661. Its totient is φ = 12307350782.

The previous prime is 12307461709. The next prime is 12307461731. The reversal of 12307461721 is 12716470321.

The square root of 12307461721 is 110939.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12716470321 = 89 ⋅142881689.

It is not a de Polignac number, because 12307461721 - 2¹⁷ = 12307330649 is a prime.

It is a super-2 number, since 2×12307461721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12307461731) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55470 + ... + 166408.

Almost surely, 2^12307461721 is an apocalyptic number.

12307461721 is the 110939-th square number.

12307461721 is the 55470-th centered octagonal number.

It is an amenable number.

12307461721 is a deficient number, since it is larger than the sum of its proper divisors (110940).

12307461721 is an frugal number, since it uses more digits than its factorization.

12307461721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221878 (or 110939 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 12307461721 in words is "twelve billion, three hundred seven million, four hundred sixty-one thousand, seven hundred twenty-one".