1211240422505 has 16 divisors (see below), whose sum is σ = 1469256379920. Its totient is φ = 958491082752.

The previous prime is 1211240422439. The next prime is 1211240422529. The reversal of 1211240422505 is 5052240421121.

It can be written as a sum of positive squares in 8 ways, for example, as 22000008976 + 1189240413529 = 148324^2 + 1090523^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211240422505 - 2¹⁰ = 1211240421481 is a prime.

It is a super-2 number, since 2×1211240422505² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 245081 + ... + 1575609.

It is an arithmetic number, because the mean of its divisors is an integer number (91828523745).

Almost surely, 2^{1211240422505} is an apocalyptic number.

It is an amenable number.

1211240422505 is a deficient number, since it is larger than the sum of its proper divisors (258015957415).

1211240422505 is a wasteful number, since it uses less digits than its factorization.

1211240422505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332508.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 1211240422505 its reverse (5052240421121), we get a palindrome (6263480843626).

The spelling of 1211240422505 in words is "one trillion, two hundred eleven billion, two hundred forty million, four hundred twenty-two thousand, five hundred five".