21111221100233 has 16 divisors (see below), whose sum is σ = 24617885910912. Its totient is φ = 17909837616000.

The previous prime is 21111221100169. The next prime is 21111221100239. The reversal of 21111221100233 is 33200112211112.

It is not a de Polignac number, because 21111221100233 - 2⁶ = 21111221100169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111221100239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1017594038 + ... + 1017614783.

It is an arithmetic number, because the mean of its divisors is an integer number (1538617869432).

Almost surely, 2^{21111221100233} is an apocalyptic number.

21111221100233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21111221100233 is a deficient number, since it is larger than the sum of its proper divisors (3506664810679).

21111221100233 is a wasteful number, since it uses less digits than its factorization.

21111221100233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035208896.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21111221100233 its reverse (33200112211112), we get a palindrome (54311333311345).

The spelling of 21111221100233 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred thousand, two hundred thirty-three".