2101201220111 has 4 divisors (see below), whose sum is σ = 2401372822992. Its totient is φ = 1801029617232.

The previous prime is 2101201220057. The next prime is 2101201220113. The reversal of 2101201220111 is 1110221021012.

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-2101201220111 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 (2101201220113) 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, 150085801430 + ... + 150085801443.

It is an arithmetic number, because the mean of its divisors is an integer number (600343205748).

Almost surely, 2^{2101201220111} is an apocalyptic number.

2101201220111 is a deficient number, since it is larger than the sum of its proper divisors (300171602881).

2101201220111 is an equidigital number, since it uses as much as digits as its factorization.

2101201220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300171602880.

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

Adding to 2101201220111 its reverse (1110221021012), we get a palindrome (3211422241123).

The spelling of 2101201220111 in words is "two trillion, one hundred one billion, two hundred one million, two hundred twenty thousand, one hundred eleven".