20102111 has 2 divisors, whose sum is σ = 20102112. Its totient is φ = 20102110.

The previous prime is 20102099. The next prime is 20102119. The reversal of 20102111 is 11120102.

It is an a-pointer prime, because the next prime (20102119) can be obtained adding 20102111 to its sum of digits (8).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20102111 - 2¹⁴ = 20085727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051055 + 10051056.

It is an arithmetic number, because the mean of its divisors is an integer number (10051056).

Almost surely, 2^20102111 is an apocalyptic number.

20102111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102111 is an equidigital number, since it uses as much as digits as its factorization.

20102111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20102111 is about 4483.5377772469. The cubic root of 20102111 is about 271.9029308689.

Adding to 20102111 its reverse (11120102), we get a palindrome (31222213).

Subtracting from 20102111 its reverse (11120102), we obtain a square (8982009 = 2997²).

It can be divided in two parts, 20102 and 111, that multiplied together give a palindrome (2231322).

The spelling of 20102111 in words is "twenty million, one hundred two thousand, one hundred eleven".