21110888833 has 4 divisors (see below), whose sum is σ = 21147476740. Its totient is φ = 21074300928.

The previous prime is 21110888797. The next prime is 21110888857. The reversal of 21110888833 is 33888801112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21041533249 + 69355584 = 145057^2 + 8328^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110888833 - 2¹³ = 21110880641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110888833.

It is not an unprimeable number, because it can be changed into a prime (21110888863) 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, 18293088 + ... + 18294241.

It is an arithmetic number, because the mean of its divisors is an integer number (5286869185).

Almost surely, 2^21110888833 is an apocalyptic number.

It is an amenable number.

21110888833 is a deficient number, since it is larger than the sum of its proper divisors (36587907).

21110888833 is an equidigital number, since it uses as much as digits as its factorization.

21110888833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36587906.

The product of its (nonzero) digits is 73728, while the sum is 43.

The spelling of 21110888833 in words is "twenty-one billion, one hundred ten million, eight hundred eighty-eight thousand, eight hundred thirty-three".