1216824885901 has 2 divisors, whose sum is σ = 1216824885902. Its totient is φ = 1216824885900.

The previous prime is 1216824885851. The next prime is 1216824885907. The reversal of 1216824885901 is 1095884286121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826417355625 + 390407530276 = 909075^2 + 624826^2 .

It is an emirp because it is prime and its reverse (1095884286121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216824885901 - 2¹¹ = 1216824883853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216824885907) 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, 608412442950 + 608412442951.

It is an arithmetic number, because the mean of its divisors is an integer number (608412442951).

Almost surely, 2^{1216824885901} is an apocalyptic number.

It is an amenable number.

1216824885901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216824885901 is an equidigital number, since it uses as much as digits as its factorization.

1216824885901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2211840, while the sum is 55.

The spelling of 1216824885901 in words is "one trillion, two hundred sixteen billion, eight hundred twenty-four million, eight hundred eighty-five thousand, nine hundred one".