21402044113 has 2 divisors, whose sum is σ = 21402044114. Its totient is φ = 21402044112.

The previous prime is 21402044077. The next prime is 21402044123. The reversal of 21402044113 is 31144020412.

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., 12242979904 + 9159064209 = 110648^2 + 95703^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402044113 - 2¹⁷ = 21401913041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21402044123) 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, 10701022056 + 10701022057.

It is an arithmetic number, because the mean of its divisors is an integer number (10701022057).

Almost surely, 2^21402044113 is an apocalyptic number.

It is an amenable number.

21402044113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402044113 is an equidigital number, since it uses as much as digits as its factorization.

21402044113 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 21402044113 its reverse (31144020412), we get a palindrome (52546064525).

The spelling of 21402044113 in words is "twenty-one billion, four hundred two million, forty-four thousand, one hundred thirteen".