21080266 has 8 divisors (see below), whose sum is σ = 31640544. Its totient is φ = 10533420.

The previous prime is 21080261. The next prime is 21080317. The reversal of 21080266 is 66208012.

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

It is a super-2 number, since 2×21080266² = 888755229261512, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21080266.

It is not an unprimeable number, because it can be changed into a prime (21080261) 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, 2901 + ... + 7111.

It is an arithmetic number, because the mean of its divisors is an integer number (3955068).

Almost surely, 2^21080266 is an apocalyptic number.

21080266 is a deficient number, since it is larger than the sum of its proper divisors (10560278).

21080266 is a wasteful number, since it uses less digits than its factorization.

21080266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6716.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21080266 is about 4591.3250810632. The cubic root of 21080266 is about 276.2434752047.

Adding to 21080266 its reverse (66208012), we get a palindrome (87288278).

The spelling of 21080266 in words is "twenty-one million, eighty thousand, two hundred sixty-six".