21100213233 has 16 divisors (see below), whose sum is σ = 34101355200. Its totient is φ = 12788007840.

The previous prime is 21100213231. The next prime is 21100213237. The reversal of 21100213233 is 33231200112.

It is not a de Polignac number, because 21100213233 - 2¹ = 21100213231 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21100213231) 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, 35521948 + ... + 35522541.

It is an arithmetic number, because the mean of its divisors is an integer number (2131334700).

Almost surely, 2^21100213233 is an apocalyptic number.

It is an amenable number.

21100213233 is a deficient number, since it is larger than the sum of its proper divisors (13001141967).

21100213233 is a wasteful number, since it uses less digits than its factorization.

21100213233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71044509 (or 71044503 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21100213233 its reverse (33231200112), we get a palindrome (54331413345).

The spelling of 21100213233 in words is "twenty-one billion, one hundred million, two hundred thirteen thousand, two hundred thirty-three".