21100234213 has 2 divisors, whose sum is σ = 21100234214. Its totient is φ = 21100234212.

The previous prime is 21100234159. The next prime is 21100234241. The reversal of 21100234213 is 31243200112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21072006244 + 28227969 = 145162^2 + 5313^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100234213 - 2³³ = 12510299621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100234273) 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, 10550117106 + 10550117107.

It is an arithmetic number, because the mean of its divisors is an integer number (10550117107).

Almost surely, 2^21100234213 is an apocalyptic number.

It is an amenable number.

21100234213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100234213 is an equidigital number, since it uses as much as digits as its factorization.

21100234213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21100234213 its reverse (31243200112), we get a palindrome (52343434325).

The spelling of 21100234213 in words is "twenty-one billion, one hundred million, two hundred thirty-four thousand, two hundred thirteen".