1200001021111 has 2 divisors, whose sum is σ = 1200001021112. Its totient is φ = 1200001021110.

The previous prime is 1200001021091. The next prime is 1200001021127. The reversal of 1200001021111 is 1111201000021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200001021111 - 2¹⁵ = 1200000988343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200001051111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600000510555 + 600000510556.

It is an arithmetic number, because the mean of its divisors is an integer number (600000510556).

Almost surely, 2^{1200001021111} is an apocalyptic number.

1200001021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200001021111 is an equidigital number, since it uses as much as digits as its factorization.

1200001021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1200001021111 its reverse (1111201000021), we get a palindrome (2311202021132).

The spelling of 1200001021111 in words is "one trillion, two hundred billion, one million, twenty-one thousand, one hundred eleven".