12792221 has 4 divisors (see below), whose sum is σ = 13776252. Its totient is φ = 11808192.

The previous prime is 12792217. The next prime is 12792229. The reversal of 12792221 is 12229721.

12792221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8323225 + 4468996 = 2885^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12792221 - 2² = 12792217 is a prime.

It is a super-2 number, since 2×12792221² = 327281836225682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12792229) 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, 491996 + ... + 492021.

It is an arithmetic number, because the mean of its divisors is an integer number (3444063).

Almost surely, 2^12792221 is an apocalyptic number.

It is an amenable number.

12792221 is a deficient number, since it is larger than the sum of its proper divisors (984031).

12792221 is an equidigital number, since it uses as much as digits as its factorization.

12792221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984030.

The product of its digits is 1008, while the sum is 26.

The square root of 12792221 is about 3576.6214504753. The cubic root of 12792221 is about 233.8740220917.

Subtracting from 12792221 its reverse (12229721), we obtain a square (562500 = 750²).

The spelling of 12792221 in words is "twelve million, seven hundred ninety-two thousand, two hundred twenty-one".