1200121221109 has 2 divisors, whose sum is σ = 1200121221110. Its totient is φ = 1200121221108.

The previous prime is 1200121221083. The next prime is 1200121221137. The reversal of 1200121221109 is 9011221210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757982666884 + 442138554225 = 870622^2 + 664935^2 .

It is an emirp because it is prime and its reverse (9011221210021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200121221109 - 2¹¹ = 1200121219061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200121221109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200121221139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060610554 + 600060610555.

It is an arithmetic number, because the mean of its divisors is an integer number (600060610555).

Almost surely, 2^{1200121221109} is an apocalyptic number.

It is an amenable number.

1200121221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200121221109 is an equidigital number, since it uses as much as digits as its factorization.

1200121221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1200121221109 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred nine".