21369049711 has 4 divisors (see below), whose sum is σ = 21376882800. Its totient is φ = 21361216624.

The previous prime is 21369049699. The next prime is 21369049717. The reversal of 21369049711 is 11794096312.

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 21369049711 - 2⁵ = 21369049679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369049717) 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, 3912451 + ... + 3917908.

It is an arithmetic number, because the mean of its divisors is an integer number (5344220700).

Almost surely, 2^21369049711 is an apocalyptic number.

21369049711 is a deficient number, since it is larger than the sum of its proper divisors (7833089).

21369049711 is an equidigital number, since it uses as much as digits as its factorization.

21369049711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833088.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 21369049711 in words is "twenty-one billion, three hundred sixty-nine million, forty-nine thousand, seven hundred eleven".