102820111 has 2 divisors, whose sum is σ = 102820112. Its totient is φ = 102820110.

The previous prime is 102820103. The next prime is 102820117. The reversal of 102820111 is 111028201.

It is a strong prime.

It is an emirp because it is prime and its reverse (111028201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102820111 - 2³ = 102820103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102820117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51410055 + 51410056.

It is an arithmetic number, because the mean of its divisors is an integer number (51410056).

Almost surely, 2^102820111 is an apocalyptic number.

102820111 is a deficient number, since it is larger than the sum of its proper divisors (1).

102820111 is an equidigital number, since it uses as much as digits as its factorization.

102820111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 102820111 is about 10140.0251972074. The cubic root of 102820111 is about 468.4817630730.

Adding to 102820111 its reverse (111028201), we get a palindrome (213848312).

The spelling of 102820111 in words is "one hundred two million, eight hundred twenty thousand, one hundred eleven".