21100113233 has 2 divisors, whose sum is σ = 21100113234. Its totient is φ = 21100113232.

The previous prime is 21100113211. The next prime is 21100113241. The reversal of 21100113233 is 33231100112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11507281984 + 9592831249 = 107272^2 + 97943^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100113233 - 2²² = 21095918929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100113283) 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 as a sum of consecutive naturals, namely, 10550056616 + 10550056617.

It is an arithmetic number, because the mean of its divisors is an integer number (10550056617).

Almost surely, 2^21100113233 is an apocalyptic number.

It is an amenable number.

21100113233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100113233 is an equidigital number, since it uses as much as digits as its factorization.

21100113233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21100113233 its reverse (33231100112), we get a palindrome (54331213345).

The spelling of 21100113233 in words is "twenty-one billion, one hundred million, one hundred thirteen thousand, two hundred thirty-three".