21236545311 has 16 divisors (see below), whose sum is σ = 29552994816. Its totient is φ = 13539167136.

The previous prime is 21236545261. The next prime is 21236545327. The reversal of 21236545311 is 11354563212.

It is not a de Polignac number, because 21236545311 - 2⁶ = 21236545247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236545391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306921 + ... + 369693.

It is an arithmetic number, because the mean of its divisors is an integer number (1847062176).

Almost surely, 2^21236545311 is an apocalyptic number.

21236545311 is a deficient number, since it is larger than the sum of its proper divisors (8316449505).

21236545311 is a wasteful number, since it uses less digits than its factorization.

21236545311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67702.

The product of its digits is 21600, while the sum is 33.

The spelling of 21236545311 in words is "twenty-one billion, two hundred thirty-six million, five hundred forty-five thousand, three hundred eleven".