21111144013 has 2 divisors, whose sum is σ = 21111144014. Its totient is φ = 21111144012.

The previous prime is 21111144011. The next prime is 21111144029. The reversal of 21111144013 is 31044111112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21053429604 + 57714409 = 145098^2 + 7597^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111144013 - 2¹ = 21111144011 is a prime.

Together with 21111144011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111144011) 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, 10555572006 + 10555572007.

It is an arithmetic number, because the mean of its divisors is an integer number (10555572007).

Almost surely, 2^21111144013 is an apocalyptic number.

It is an amenable number.

21111144013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111144013 is an equidigital number, since it uses as much as digits as its factorization.

21111144013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21111144013 its reverse (31044111112), we get a palindrome (52155255125).

The spelling of 21111144013 in words is "twenty-one billion, one hundred eleven million, one hundred forty-four thousand, thirteen".