1201211220109 has 2 divisors, whose sum is σ = 1201211220110. Its totient is φ = 1201211220108.

The previous prime is 1201211220103. The next prime is 1201211220127. The reversal of 1201211220109 is 9010221121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106710312009 + 94500908100 = 1052003^2 + 307410^2 .

It is an emirp because it is prime and its reverse (9010221121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201211220109 - 2²¹ = 1201209122957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201211220109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201211220103) 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, 600605610054 + 600605610055.

It is an arithmetic number, because the mean of its divisors is an integer number (600605610055).

Almost surely, 2^{1201211220109} is an apocalyptic number.

It is an amenable number.

1201211220109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201211220109 is an equidigital number, since it uses as much as digits as its factorization.

1201211220109 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 22.

The spelling of 1201211220109 in words is "one trillion, two hundred one billion, two hundred eleven million, two hundred twenty thousand, one hundred nine".