21347266 has 12 divisors (see below), whose sum is σ = 33475302. Its totient is φ = 10209056.

The previous prime is 21347239. The next prime is 21347267. The reversal of 21347266 is 66274312.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 4774225 = 4071^2 + 2185^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9031 + ... + 11146.

Almost surely, 2^21347266 is an apocalyptic number.

21347266 is a deficient number, since it is larger than the sum of its proper divisors (12128036).

21347266 is a wasteful number, since it uses less digits than its factorization.

21347266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20225 (or 20202 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 21347266 is about 4620.3101627488. The cubic root of 21347266 is about 277.4048739230.

The spelling of 21347266 in words is "twenty-one million, three hundred forty-seven thousand, two hundred sixty-six".