1211222001061 has 2 divisors, whose sum is σ = 1211222001062. Its totient is φ = 1211222001060.

The previous prime is 1211222001053. The next prime is 1211222001113. The reversal of 1211222001061 is 1601002221121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 864779104225 + 346442896836 = 929935^2 + 588594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222001061 - 2³ = 1211222001053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211222001461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611000530 + 605611000531.

It is an arithmetic number, because the mean of its divisors is an integer number (605611000531).

Almost surely, 2^{1211222001061} is an apocalyptic number.

It is an amenable number.

1211222001061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222001061 is an equidigital number, since it uses as much as digits as its factorization.

1211222001061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1211222001061 its reverse (1601002221121), we get a palindrome (2812224222182).

The spelling of 1211222001061 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one thousand, sixty-one".