1211200001993 has 4 divisors (see below), whose sum is σ = 1243935137220. Its totient is φ = 1178464866768.

The previous prime is 1211200001989. The next prime is 1211200002007. The reversal of 1211200001993 is 3991000021121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1032158466304 + 179041535689 = 1015952^2 + 423133^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211200001993 - 2² = 1211200001989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211200001593) 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 3 ways as a sum of consecutive naturals, for example, 16367567558 + ... + 16367567631.

It is an arithmetic number, because the mean of its divisors is an integer number (310983784305).

Almost surely, 2^{1211200001993} is an apocalyptic number.

It is an amenable number.

1211200001993 is a deficient number, since it is larger than the sum of its proper divisors (32735135227).

1211200001993 is an equidigital number, since it uses as much as digits as its factorization.

1211200001993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32735135226.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 1211200001993 in words is "one trillion, two hundred eleven billion, two hundred million, one thousand, nine hundred ninety-three".