1200111110021 has 2 divisors, whose sum is σ = 1200111110022. Its totient is φ = 1200111110020.

The previous prime is 1200111109993. The next prime is 1200111110089.

1200111110021 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 920619141121 + 279491968900 = 959489^2 + 528670^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200111110021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200111109984 and 1200111110011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200111110221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600055555010 + 600055555011.

It is an arithmetic number, because the mean of its divisors is an integer number (600055555011).

Almost surely, 2^{1200111110021} is an apocalyptic number.

It is an amenable number.

1200111110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200111110021 is an equidigital number, since it uses as much as digits as its factorization.

1200111110021 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.

Multiplying 1200111110021 by its sum of digits (11), we get a palindrome (13201222210231).

The spelling of 1200111110021 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred ten thousand, twenty-one".