21264044040211 has 4 divisors (see below), whose sum is σ = 24301764617392. Its totient is φ = 18226323463032.

The previous prime is 21264044040193. The next prime is 21264044040247. The reversal of 21264044040211 is 11204044046212.

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 21264044040211 - 2⁹ = 21264044039699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21264044041211) 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, 1518860288580 + ... + 1518860288593.

It is an arithmetic number, because the mean of its divisors is an integer number (6075441154348).

Almost surely, 2^{21264044040211} is an apocalyptic number.

21264044040211 is a deficient number, since it is larger than the sum of its proper divisors (3037720577181).

21264044040211 is an equidigital number, since it uses as much as digits as its factorization.

21264044040211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037720577180.

The product of its (nonzero) digits is 12288, while the sum is 31.

Adding to 21264044040211 its reverse (11204044046212), we get a palindrome (32468088086423).

The spelling of 21264044040211 in words is "twenty-one trillion, two hundred sixty-four billion, forty-four million, forty thousand, two hundred eleven".