21264446211 has 4 divisors (see below), whose sum is σ = 28352594952. Its totient is φ = 14176297472.

The previous prime is 21264446191. The next prime is 21264446233. The reversal of 21264446211 is 11264446212.

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

It is a cyclic number.

It is not a de Polignac number, because 21264446211 - 2³⁴ = 4084577027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21264445211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3544074366 + ... + 3544074371.

It is an arithmetic number, because the mean of its divisors is an integer number (7088148738).

Almost surely, 2^21264446211 is an apocalyptic number.

21264446211 is a deficient number, since it is larger than the sum of its proper divisors (7088148741).

21264446211 is an equidigital number, since it uses as much as digits as its factorization.

21264446211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7088148740.

The product of its digits is 18432, while the sum is 33.

Subtracting from 21264446211 its reverse (11264446212), we obtain a palindrome (9999999999).

The spelling of 21264446211 in words is "twenty-one billion, two hundred sixty-four million, four hundred forty-six thousand, two hundred eleven".