21110533311 has 16 divisors (see below), whose sum is σ = 32288025600. Its totient is φ = 12018314208.

The previous prime is 21110533289. The next prime is 21110533351. The reversal of 21110533311 is 11333501112.

It is not a de Polignac number, because 21110533311 - 2⁷ = 21110533183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110533351) 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, 1862871 + ... + 1874168.

It is an arithmetic number, because the mean of its divisors is an integer number (2018001600).

Almost surely, 2^21110533311 is an apocalyptic number.

21110533311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21110533311 is a deficient number, since it is larger than the sum of its proper divisors (11177492289).

21110533311 is a wasteful number, since it uses less digits than its factorization.

21110533311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737318.

The product of its (nonzero) digits is 270, while the sum is 21.

The spelling of 21110533311 in words is "twenty-one billion, one hundred ten million, five hundred thirty-three thousand, three hundred eleven".