21115464266 has 8 divisors (see below), whose sum is σ = 34109596164. Its totient is φ = 9745598880.

The previous prime is 21115464263. The next prime is 21115464277. The reversal of 21115464266 is 66246451112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15111539041 + 6003925225 = 122929^2 + 77485^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21115464263) 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, 406066595 + ... + 406066646.

Almost surely, 2^21115464266 is an apocalyptic number.

21115464266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21115464266 is a deficient number, since it is larger than the sum of its proper divisors (12994131898).

21115464266 is a wasteful number, since it uses less digits than its factorization.

21115464266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812133256.

The product of its digits is 69120, while the sum is 38.

The spelling of 21115464266 in words is "twenty-one billion, one hundred fifteen million, four hundred sixty-four thousand, two hundred sixty-six".