21342103111 has 4 divisors (see below), whose sum is σ = 24390974992. Its totient is φ = 18293231232.

The previous prime is 21342103087. The next prime is 21342103117. The reversal of 21342103111 is 11130124312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21342103111 - 2⁹ = 21342102599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342103117) 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 in 3 ways as a sum of consecutive naturals, for example, 1524435930 + ... + 1524435943.

It is an arithmetic number, because the mean of its divisors is an integer number (6097743748).

Almost surely, 2^21342103111 is an apocalyptic number.

21342103111 is a deficient number, since it is larger than the sum of its proper divisors (3048871881).

21342103111 is an equidigital number, since it uses as much as digits as its factorization.

21342103111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048871880.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21342103111 its reverse (11130124312), we get a palindrome (32472227423).

The spelling of 21342103111 in words is "twenty-one billion, three hundred forty-two million, one hundred three thousand, one hundred eleven".