2102021111 has 2 divisors, whose sum is σ = 2102021112. Its totient is φ = 2102021110.

The previous prime is 2102021107. The next prime is 2102021147. The reversal of 2102021111 is 1111202012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2102021111 - 2² = 2102021107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102021092 and 2102021101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102221111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051010555 + 1051010556.

It is an arithmetic number, because the mean of its divisors is an integer number (1051010556).

Almost surely, 2^2102021111 is an apocalyptic number.

2102021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102021111 is an equidigital number, since it uses as much as digits as its factorization.

2102021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2102021111 is about 45847.8037750992. The cubic root of 2102021111 is about 1280.9898574889.

Adding to 2102021111 its reverse (1111202012), we get a palindrome (3213223123).

The spelling of 2102021111 in words is "two billion, one hundred two million, twenty-one thousand, one hundred eleven".