203121134242111 has 2 divisors, whose sum is σ = 203121134242112. Its totient is φ = 203121134242110.

The previous prime is 203121134242109. The next prime is 203121134242139. The reversal of 203121134242111 is 111242431121302.

It is an a-pointer prime, because the next prime (203121134242139) can be obtained adding 203121134242111 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 203121134242111 - 2¹ = 203121134242109 is a prime.

Together with 203121134242109, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 203121134242111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203121134242141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560567121055 + 101560567121056.

It is an arithmetic number, because the mean of its divisors is an integer number (101560567121056).

Almost surely, 2^{203121134242111} is an apocalyptic number.

203121134242111 is a deficient number, since it is larger than the sum of its proper divisors (1).

203121134242111 is an equidigital number, since it uses as much as digits as its factorization.

203121134242111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 203121134242111 its reverse (111242431121302), we get a palindrome (314363565363413).

The spelling of 203121134242111 in words is "two hundred three trillion, one hundred twenty-one billion, one hundred thirty-four million, two hundred forty-two thousand, one hundred eleven".