2001202211111 has 4 divisors (see below), whose sum is σ = 2001423127800. Its totient is φ = 2000981294424.

The previous prime is 2001202211081. The next prime is 2001202211123. The reversal of 2001202211111 is 1111122021002.

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-2001202211111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001202211311) 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, 110444756 + ... + 110462873.

It is an arithmetic number, because the mean of its divisors is an integer number (500355781950).

Almost surely, 2^{2001202211111} is an apocalyptic number.

2001202211111 is a deficient number, since it is larger than the sum of its proper divisors (220916689).

2001202211111 is an equidigital number, since it uses as much as digits as its factorization.

2001202211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220916688.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2001202211111 its reverse (1111122021002), we get a palindrome (3112324232113).

The spelling of 2001202211111 in words is "two trillion, one billion, two hundred two million, two hundred eleven thousand, one hundred eleven".