1211010009999 has 4 divisors (see below), whose sum is σ = 1614680013336. Its totient is φ = 807340006664.

The previous prime is 1211010009983. The next prime is 1211010010037. The reversal of 1211010009999 is 9999000101121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211010009999 - 2⁴ = 1211010009983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211010009999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211010009299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201835001664 + ... + 201835001669.

It is an arithmetic number, because the mean of its divisors is an integer number (403670003334).

Almost surely, 2^{1211010009999} is an apocalyptic number.

1211010009999 is a deficient number, since it is larger than the sum of its proper divisors (403670003337).

1211010009999 is an equidigital number, since it uses as much as digits as its factorization.

1211010009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403670003336.

The product of its (nonzero) digits is 13122, while the sum is 42.

The spelling of 1211010009999 in words is "one trillion, two hundred eleven billion, ten million, nine thousand, nine hundred ninety-nine".