21342112202111 has 4 divisors (see below), whose sum is σ = 22465381265400. Its totient is φ = 20218843138824.

The previous prime is 21342112202107. The next prime is 21342112202227. The reversal of 21342112202111 is 11120221124312.

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 21342112202111 - 2² = 21342112202107 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 (21342112202311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561634531616 + ... + 561634531653.

It is an arithmetic number, because the mean of its divisors is an integer number (5616345316350).

Almost surely, 2^{21342112202111} is an apocalyptic number.

21342112202111 is a deficient number, since it is larger than the sum of its proper divisors (1123269063289).

21342112202111 is a wasteful number, since it uses less digits than its factorization.

21342112202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123269063288.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21342112202111 its reverse (11120221124312), we get a palindrome (32462333326423).

The spelling of 21342112202111 in words is "twenty-one trillion, three hundred forty-two billion, one hundred twelve million, two hundred two thousand, one hundred eleven".