1200209120021 has 2 divisors, whose sum is σ = 1200209120022. Its totient is φ = 1200209120020.

The previous prime is 1200209120017. The next prime is 1200209120051. The reversal of 1200209120021 is 1200219020021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837931528996 + 362277591025 = 915386^2 + 601895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200209120021 - 2² = 1200209120017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200209119975 and 1200209120002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200209120051) 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, 600104560010 + 600104560011.

It is an arithmetic number, because the mean of its divisors is an integer number (600104560011).

Almost surely, 2^{1200209120021} is an apocalyptic number.

It is an amenable number.

1200209120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200209120021 is an equidigital number, since it uses as much as digits as its factorization.

1200209120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 1200209120021 in words is "one trillion, two hundred billion, two hundred nine million, one hundred twenty thousand, twenty-one".