12921778276 has 27 divisors (see below), whose sum is σ = 24860546067. Its totient is φ = 5872398840.

The previous prime is 12921778237. The next prime is 12921778279. The reversal of 12921778276 is 67287712921.

The square root of 12921778276 is 113674.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921778279) 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, 2498245 + ... + 2503411.

Almost surely, 2^12921778276 is an apocalyptic number.

12921778276 is the 113674-th square number.

It is an amenable number.

12921778276 is a deficient number, since it is larger than the sum of its proper divisors (11938767791).

12921778276 is an frugal number, since it uses more digits than its factorization.

12921778276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10360 (or 5180 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 52.

It can be divided in two parts, 12921 and 778276, that added together give a palindrome (791197).

The spelling of 12921778276 in words is "twelve billion, nine hundred twenty-one million, seven hundred seventy-eight thousand, two hundred seventy-six".