100121111 has 2 divisors, whose sum is σ = 100121112. Its totient is φ = 100121110.

The previous prime is 100121039. The next prime is 100121123. The reversal of 100121111 is 111121001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100121111 - 2¹⁴ = 100104727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060555 + 50060556.

It is an arithmetic number, because the mean of its divisors is an integer number (50060556).

Almost surely, 2^100121111 is an apocalyptic number.

100121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121111 is an equidigital number, since it uses as much as digits as its factorization.

100121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 100121111 is about 10006.0537176251. The cubic root of 100121111 is about 464.3461902536.

Adding to 100121111 its reverse (111121001), we get a palindrome (211242112).

The spelling of 100121111 in words is "one hundred million, one hundred twenty-one thousand, one hundred eleven".