102120420055 has 16 divisors (see below), whose sum is σ = 128374876800. Its totient is φ = 77880741120.

The previous prime is 102120420047. The next prime is 102120420079. The reversal of 102120420055 is 550024021201.

It is not a de Polignac number, because 102120420055 - 2³ = 102120420047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4446006 + ... + 4468915.

It is an arithmetic number, because the mean of its divisors is an integer number (8023429800).

Almost surely, 2^102120420055 is an apocalyptic number.

102120420055 is a deficient number, since it is larger than the sum of its proper divisors (26254456745).

102120420055 is an equidigital number, since it uses as much as digits as its factorization.

102120420055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8915034.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 102120420055 its reverse (550024021201), we get a palindrome (652144441256).

The spelling of 102120420055 in words is "one hundred two billion, one hundred twenty million, four hundred twenty thousand, fifty-five".