1211111322203 has 4 divisors (see below), whose sum is σ = 1211119326720. Its totient is φ = 1211103317688.

The previous prime is 1211111322167. The next prime is 1211111322209. The reversal of 1211111322203 is 3022231111121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211111322203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211111322209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3770843 + ... + 4079396.

It is an arithmetic number, because the mean of its divisors is an integer number (302779831680).

Almost surely, 2^{1211111322203} is an apocalyptic number.

1211111322203 is a deficient number, since it is larger than the sum of its proper divisors (8004517).

1211111322203 is an equidigital number, since it uses as much as digits as its factorization.

1211111322203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004516.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1211111322203 its reverse (3022231111121), we get a palindrome (4233342433324).

The spelling of 1211111322203 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred twenty-two thousand, two hundred three".