102120020111 has 4 divisors (see below), whose sum is σ = 102120669672. Its totient is φ = 102119370552.

The previous prime is 102120020083. The next prime is 102120020117. The reversal of 102120020111 is 111020021201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 102120020111 - 2¹⁸ = 102119757967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102120020092 and 102120020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120020117) 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, 75416 + ... + 458178.

It is an arithmetic number, because the mean of its divisors is an integer number (25530167418).

Almost surely, 2^102120020111 is an apocalyptic number.

102120020111 is a deficient number, since it is larger than the sum of its proper divisors (649561).

102120020111 is an equidigital number, since it uses as much as digits as its factorization.

102120020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649560.

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

Adding to 102120020111 its reverse (111020021201), we get a palindrome (213140041312).

The spelling of 102120020111 in words is "one hundred two billion, one hundred twenty million, twenty thousand, one hundred eleven".