210100121111 has 2 divisors, whose sum is σ = 210100121112. Its totient is φ = 210100121110.

The previous prime is 210100121083. The next prime is 210100121113. The reversal of 210100121111 is 111121001012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210100121111 is a prime.

It is a Sophie Germain prime.

Together with 210100121113, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 210100121092 and 210100121101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210100121113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050060555 + 105050060556.

It is an arithmetic number, because the mean of its divisors is an integer number (105050060556).

Almost surely, 2^210100121111 is an apocalyptic number.

210100121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

210100121111 is an equidigital number, since it uses as much as digits as its factorization.

210100121111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 210100121111 its reverse (111121001012), we get a palindrome (321221122123).

The spelling of 210100121111 in words is "two hundred ten billion, one hundred million, one hundred twenty-one thousand, one hundred eleven".