121111000001 has 2 divisors, whose sum is σ = 121111000002. Its totient is φ = 121111000000.

The previous prime is 121110999979. The next prime is 121111000009. The reversal of 121111000001 is 100000111121.

It is a happy number.

It is an a-pointer prime, because the next prime (121111000009) can be obtained adding 121111000001 to its sum of digits (8).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68146580401 + 52964419600 = 261049^2 + 230140^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111000001 - 2¹⁸ = 121110737857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121111000009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555500000 + 60555500001.

It is an arithmetic number, because the mean of its divisors is an integer number (60555500001).

Almost surely, 2^121111000001 is an apocalyptic number.

It is an amenable number.

121111000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111000001 is an equidigital number, since it uses as much as digits as its factorization.

121111000001 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.

Adding to 121111000001 its reverse (100000111121), we get a palindrome (221111111122).

The spelling of 121111000001 in words is "one hundred twenty-one billion, one hundred eleven million, one", and thus it is an aban number.