2102020111 has 4 divisors (see below), whose sum is σ = 2102243800. Its totient is φ = 2101796424.

The previous prime is 2102020073. The next prime is 2102020147. The reversal of 2102020111 is 1110202012.

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 2102020111 - 2⁹ = 2102019599 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 (2102020171) 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, 97101 + ... + 116758.

It is an arithmetic number, because the mean of its divisors is an integer number (525560950).

Almost surely, 2^2102020111 is an apocalyptic number.

2102020111 is a deficient number, since it is larger than the sum of its proper divisors (223689).

2102020111 is an equidigital number, since it uses as much as digits as its factorization.

2102020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223688.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2102020111 is about 45847.7928694501. The cubic root of 2102020111 is about 1280.9896543527.

Adding to 2102020111 its reverse (1110202012), we get a palindrome (3212222123).

It can be divided in two parts, 210202011 and 1, that added together give a palindrome (210202012).

The spelling of 2102020111 in words is "two billion, one hundred two million, twenty thousand, one hundred eleven".