12031676721 has 9 divisors (see below), whose sum is σ = 17379563929. Its totient is φ = 8020898436.

The previous prime is 12031676711. The next prime is 12031676749. The reversal of 12031676721 is 12767613021.

It is a happy number.

The square root of 12031676721 is 109689.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 12031676721 - 2¹⁷ = 12031545649 is a prime.

It is a super-2 number, since 2×12031676721² (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 (12031676711) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 310786 + ... + 347348.

Almost surely, 2^12031676721 is an apocalyptic number.

12031676721 is the 109689-th square number.

12031676721 is the 54845-th centered octagonal number.

It is an amenable number.

12031676721 is a deficient number, since it is larger than the sum of its proper divisors (5347887208).

12031676721 is an frugal number, since it uses more digits than its factorization.

12031676721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73132 (or 36566 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

Multiplying 12031676721 by its sum of digits (36), we get a square (433140361956 = 658134²).

The spelling of 12031676721 in words is "twelve billion, thirty-one million, six hundred seventy-six thousand, seven hundred twenty-one".