102120111556556 has 12 divisors (see below), whose sum is σ = 178853277855000. Its totient is φ = 51019175026560.

The previous prime is 102120111556537. The next prime is 102120111556571. The reversal of 102120111556556 is 655655111021201.

It is a super-2 number, since 2×102120111556556² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10220182310 + ... + 10220192301.

It is an arithmetic number, because the mean of its divisors is an integer number (14904439821250).

Almost surely, 2^{102120111556556} is an apocalyptic number.

It is an amenable number.

102120111556556 is a deficient number, since it is larger than the sum of its proper divisors (76733166298444).

102120111556556 is a wasteful number, since it uses less digits than its factorization.

102120111556556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20440375864 (or 20440375862 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 41.

Adding to 102120111556556 its reverse (655655111021201), we get a palindrome (757775222577757).

The spelling of 102120111556556 in words is "one hundred two trillion, one hundred twenty billion, one hundred eleven million, five hundred fifty-six thousand, five hundred fifty-six".