1211121121061 has 2 divisors, whose sum is σ = 1211121121062. Its totient is φ = 1211121121060.

The previous prime is 1211121121037. The next prime is 1211121121121. The reversal of 1211121121061 is 1601211211121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1157709288961 + 53411832100 = 1075969^2 + 231110^2 .

It is an emirp because it is prime and its reverse (1601211211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211121121061 - 2⁶ = 1211121120997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211126121061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605560560530 + 605560560531.

It is an arithmetic number, because the mean of its divisors is an integer number (605560560531).

Almost surely, 2^{1211121121061} is an apocalyptic number.

It is an amenable number.

1211121121061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211121121061 is an equidigital number, since it uses as much as digits as its factorization.

1211121121061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 1211121121061 its reverse (1601211211121), we get a palindrome (2812332332182).

The spelling of 1211121121061 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, sixty-one".