1211222001461 has 2 divisors, whose sum is σ = 1211222001462. Its totient is φ = 1211222001460.

The previous prime is 1211222001371. The next prime is 1211222001523. The reversal of 1211222001461 is 1641002221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1148862422500 + 62359578961 = 1071850^2 + 249719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222001461 - 2³⁴ = 1194042132277 is a prime.

It is a super-2 number, since 2×1211222001461² (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 (1211222001061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611000730 + 605611000731.

It is an arithmetic number, because the mean of its divisors is an integer number (605611000731).

Almost surely, 2^{1211222001461} is an apocalyptic number.

It is an amenable number.

1211222001461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222001461 is an equidigital number, since it uses as much as digits as its factorization.

1211222001461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 1211222001461 its reverse (1641002221121), we get a palindrome (2852224222582).

The spelling of 1211222001461 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one thousand, four hundred sixty-one".