21202111233 has 16 divisors (see below), whose sum is σ = 31446143040. Its totient is φ = 14118717312.

The previous prime is 21202111171. The next prime is 21202111253. The reversal of 21202111233 is 33211120212.

It is not a de Polignac number, because 21202111233 - 2⁸ = 21202110977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21202111253) 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, 420816 + ... + 468497.

It is an arithmetic number, because the mean of its divisors is an integer number (1965383940).

Almost surely, 2^21202111233 is an apocalyptic number.

It is an amenable number.

21202111233 is a deficient number, since it is larger than the sum of its proper divisors (10244031807).

21202111233 is an equidigital number, since it uses as much as digits as its factorization.

21202111233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890205 (or 890199 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21202111233 its reverse (33211120212), we get a palindrome (54413231445).

The spelling of 21202111233 in words is "twenty-one billion, two hundred two million, one hundred eleven thousand, two hundred thirty-three".