21144326511 has 16 divisors (see below), whose sum is σ = 35149010688. Its totient is φ = 10984065600.

The previous prime is 21144326507. The next prime is 21144326513. The reversal of 21144326511 is 11562344112.

It is not a de Polignac number, because 21144326511 - 2² = 21144326507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144326513) 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 15 ways as a sum of consecutive naturals, for example, 45766710 + ... + 45767171.

It is an arithmetic number, because the mean of its divisors is an integer number (2196813168).

Almost surely, 2^21144326511 is an apocalyptic number.

21144326511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21144326511 is a deficient number, since it is larger than the sum of its proper divisors (14004684177).

21144326511 is a wasteful number, since it uses less digits than its factorization.

21144326511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91533902.

The product of its digits is 5760, while the sum is 30.

The spelling of 21144326511 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty-six thousand, five hundred eleven".