21131030266 has 8 divisors (see below), whose sum is σ = 31719838644. Its totient is φ = 10557750720.

The previous prime is 21131030257. The next prime is 21131030269. The reversal of 21131030266 is 66203013112.

It can be written as a sum of positive squares in 2 ways, for example, as 21125169025 + 5861241 = 145345^2 + 2421^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21131030266.

It is not an unprimeable number, because it can be changed into a prime (21131030269) 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, 3878805 + ... + 3884248.

Almost surely, 2^21131030266 is an apocalyptic number.

21131030266 is a deficient number, since it is larger than the sum of its proper divisors (10588808378).

21131030266 is a wasteful number, since it uses less digits than its factorization.

21131030266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7764416.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21131030266 its reverse (66203013112), we get a palindrome (87334043378).

The spelling of 21131030266 in words is "twenty-one billion, one hundred thirty-one million, thirty thousand, two hundred sixty-six".