21054444113 has 2 divisors, whose sum is σ = 21054444114. Its totient is φ = 21054444112.

The previous prime is 21054444067. The next prime is 21054444149. The reversal of 21054444113 is 31144445012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18909550144 + 2144893969 = 137512^2 + 46313^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054444113 - 2⁶ = 21054444049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21054444013) 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, 10527222056 + 10527222057.

It is an arithmetic number, because the mean of its divisors is an integer number (10527222057).

Almost surely, 2^21054444113 is an apocalyptic number.

It is an amenable number.

21054444113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054444113 is an equidigital number, since it uses as much as digits as its factorization.

21054444113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21054444113 its reverse (31144445012), we get a palindrome (52198889125).

The spelling of 21054444113 in words is "twenty-one billion, fifty-four million, four hundred forty-four thousand, one hundred thirteen".