102120615516 has 12 divisors (see below), whose sum is σ = 238281436232. Its totient is φ = 34040205168.

The previous prime is 102120615433. The next prime is 102120615521. The reversal of 102120615516 is 615516021201.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×102120615516² (a number of 23 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 4255025635 + ... + 4255025658.

Almost surely, 2^102120615516 is an apocalyptic number.

It is an amenable number.

102120615516 is an abundant number, since it is smaller than the sum of its proper divisors (136160820716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102120615516 is a wasteful number, since it uses less digits than its factorization.

102120615516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8510051300 (or 8510051298 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 102120615516 its reverse (615516021201), we get a palindrome (717636636717).

The spelling of 102120615516 in words is "one hundred two billion, one hundred twenty million, six hundred fifteen thousand, five hundred sixteen".