21134888855911 has 4 divisors (see below), whose sum is σ = 21139211808000. Its totient is φ = 21130565903824.

The previous prime is 21134888855863. The next prime is 21134888855917. The reversal of 21134888855911 is 11955888843112.

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 21134888855911 - 2³⁵ = 21100529117543 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 (21134888855917) 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, 2161468711 + ... + 2161478488.

It is an arithmetic number, because the mean of its divisors is an integer number (5284802952000).

Almost surely, 2^{21134888855911} is an apocalyptic number.

21134888855911 is a deficient number, since it is larger than the sum of its proper divisors (4322952089).

21134888855911 is an equidigital number, since it uses as much as digits as its factorization.

21134888855911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322952088.

The product of its digits is 22118400, while the sum is 64.

The spelling of 21134888855911 in words is "twenty-one trillion, one hundred thirty-four billion, eight hundred eighty-eight million, eight hundred fifty-five thousand, nine hundred eleven".