21100123333 has 4 divisors (see below), whose sum is σ = 22210656160. Its totient is φ = 19989590508.

The previous prime is 21100123283. The next prime is 21100123357. The reversal of 21100123333 is 33332100112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100123333 - 2²¹ = 21098026181 is a prime.

It is a super-2 number, since 2×21100123333² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1110532807 = 21100123333 / (2 + 1 + 1 + 0 + 0 + 1 + 2 + 3 + 3 + 3 + 3).

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 21100123333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100123633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555266385 + ... + 555266422.

It is an arithmetic number, because the mean of its divisors is an integer number (5552664040).

Almost surely, 2^21100123333 is an apocalyptic number.

It is an amenable number.

21100123333 is a deficient number, since it is larger than the sum of its proper divisors (1110532827).

21100123333 is a wasteful number, since it uses less digits than its factorization.

21100123333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110532826.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21100123333 its reverse (33332100112), we get a palindrome (54432223445).

The spelling of 21100123333 in words is "twenty-one billion, one hundred million, one hundred twenty-three thousand, three hundred thirty-three".