21726041365211 has 4 divisors (see below), whose sum is σ = 21727417230624. Its totient is φ = 21724665499800.

The previous prime is 21726041365201. The next prime is 21726041365247. The reversal of 21726041365211 is 11256314062712.

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 21726041365211 - 2³⁴ = 21708861496027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21726041365201) 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, 687909020 + ... + 687940601.

It is an arithmetic number, because the mean of its divisors is an integer number (5431854307656).

Almost surely, 2^{21726041365211} is an apocalyptic number.

21726041365211 is a deficient number, since it is larger than the sum of its proper divisors (1375865413).

21726041365211 is a wasteful number, since it uses less digits than its factorization.

21726041365211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375865412.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21726041365211 in words is "twenty-one trillion, seven hundred twenty-six billion, forty-one million, three hundred sixty-five thousand, two hundred eleven".