21141266 has 4 divisors (see below), whose sum is σ = 31711902. Its totient is φ = 10570632.

The previous prime is 21141259. The next prime is 21141271. The reversal of 21141266 is 66214112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 1525225 = 4429^2 + 1235^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5285315 + ... + 5285318.

Almost surely, 2^21141266 is an apocalyptic number.

21141266 is a deficient number, since it is larger than the sum of its proper divisors (10570636).

21141266 is a wasteful number, since it uses less digits than its factorization.

21141266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10570635.

The product of its digits is 576, while the sum is 23.

The square root of 21141266 is about 4597.9632447422. The cubic root of 21141266 is about 276.5096740007.

Adding to 21141266 its reverse (66214112), we get a palindrome (87355378).

The spelling of 21141266 in words is "twenty-one million, one hundred forty-one thousand, two hundred sixty-six".