2101201111 has 4 divisors (see below), whose sum is σ = 2168981824. Its totient is φ = 2033420400.

The previous prime is 2101201097. The next prime is 2101201117. The reversal of 2101201111 is 1111021012.

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 2101201111 - 2⁵ = 2101201079 is a prime.

It is a super-2 number, since 2×2101201111² = 8830092217735268642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101201117) 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, 33890310 + ... + 33890371.

It is an arithmetic number, because the mean of its divisors is an integer number (542245456).

Almost surely, 2^2101201111 is an apocalyptic number.

2101201111 is a deficient number, since it is larger than the sum of its proper divisors (67780713).

2101201111 is an equidigital number, since it uses as much as digits as its factorization.

2101201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67780712.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 2101201111 is about 45838.8602716080. The cubic root of 2101201111 is about 1280.8232641254.

Adding to 2101201111 its reverse (1111021012), we get a palindrome (3212222123).

The spelling of 2101201111 in words is "two billion, one hundred one million, two hundred one thousand, one hundred eleven".