21202442113 has 2 divisors, whose sum is σ = 21202442114. Its totient is φ = 21202442112.

The previous prime is 21202442111. The next prime is 21202442117. The reversal of 21202442113 is 31124420212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15203629809 + 5998812304 = 123303^2 + 77452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202442113 - 2¹ = 21202442111 is a prime.

Together with 21202442111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21202442111) 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 as a sum of consecutive naturals, namely, 10601221056 + 10601221057.

It is an arithmetic number, because the mean of its divisors is an integer number (10601221057).

Almost surely, 2^21202442113 is an apocalyptic number.

It is an amenable number.

21202442113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202442113 is an equidigital number, since it uses as much as digits as its factorization.

21202442113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21202442113 its reverse (31124420212), we get a palindrome (52326862325).

The spelling of 21202442113 in words is "twenty-one billion, two hundred two million, four hundred forty-two thousand, one hundred thirteen".