102120665405 has 64 divisors (see below), whose sum is σ = 146057167872. Its totient is φ = 67705405440.

The previous prime is 102120665377. The next prime is 102120665411. The reversal of 102120665405 is 504566021201.

It is not a de Polignac number, because 102120665405 - 2¹⁰ = 102120664381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4250687 + ... + 4274643.

It is an arithmetic number, because the mean of its divisors is an integer number (2282143248).

Almost surely, 2^102120665405 is an apocalyptic number.

It is an amenable number.

102120665405 is a deficient number, since it is larger than the sum of its proper divisors (43936502467).

102120665405 is a wasteful number, since it uses less digits than its factorization.

102120665405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24134.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 102120665405 its reverse (504566021201), we get a palindrome (606686686606).

The spelling of 102120665405 in words is "one hundred two billion, one hundred twenty million, six hundred sixty-five thousand, four hundred five".