1211222001173 has 2 divisors, whose sum is σ = 1211222001174. Its totient is φ = 1211222001172.

The previous prime is 1211222001137. The next prime is 1211222001181. The reversal of 1211222001173 is 3711002221121.

It is a happy number.

Together with previous prime (1211222001137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200685594564 + 10536406609 = 1095758^2 + 102647^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222001173 - 2¹² = 1211221997077 is a prime.

It is a super-2 number, since 2×1211222001173² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211222001113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611000586 + 605611000587.

It is an arithmetic number, because the mean of its divisors is an integer number (605611000587).

Almost surely, 2^{1211222001173} is an apocalyptic number.

It is an amenable number.

1211222001173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222001173 is an equidigital number, since it uses as much as digits as its factorization.

1211222001173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 1211222001173 its reverse (3711002221121), we get a palindrome (4922224222294).

The spelling of 1211222001173 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one thousand, one hundred seventy-three".