1211201019999 has 64 divisors (see below), whose sum is σ = 1897478553600. Its totient is φ = 762024627936.

The previous prime is 1211201019997. The next prime is 1211201020021. The reversal of 1211201019999 is 9999101021121.

It is not a de Polignac number, because 1211201019999 - 2¹ = 1211201019997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201019997) 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 in 63 ways as a sum of consecutive naturals, for example, 72942432 + ... + 72959034.

It is an arithmetic number, because the mean of its divisors is an integer number (29648102400).

Almost surely, 2^{1211201019999} is an apocalyptic number.

1211201019999 is a deficient number, since it is larger than the sum of its proper divisors (686277533601).

1211201019999 is a wasteful number, since it uses less digits than its factorization.

1211201019999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201 (or 18195 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 45.

The spelling of 1211201019999 in words is "one trillion, two hundred eleven billion, two hundred one million, nineteen thousand, nine hundred ninety-nine".