12662221 has 8 divisors (see below), whose sum is σ = 14876064. Its totient is φ = 10625520.

The previous prime is 12662201. The next prime is 12662233. The reversal of 12662221 is 12226621.

12662221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12662221 - 2¹¹ = 12660173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12662192 and 12662201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12662201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44131 + ... + 44416.

It is an arithmetic number, because the mean of its divisors is an integer number (1859508).

Almost surely, 2^12662221 is an apocalyptic number.

12662221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12662221 is a deficient number, since it is larger than the sum of its proper divisors (2213843).

12662221 is a wasteful number, since it uses less digits than its factorization.

12662221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88571.

The product of its digits is 576, while the sum is 22.

The square root of 12662221 is about 3558.4014669511. The cubic root of 12662221 is about 233.0790806495.

Adding to 12662221 its reverse (12226621), we get a palindrome (24888842).

Subtracting from 12662221 its reverse (12226621), we obtain a square (435600 = 660²).

The spelling of 12662221 in words is "twelve million, six hundred sixty-two thousand, two hundred twenty-one".