102120999956 has 12 divisors (see below), whose sum is σ = 178716794592. Its totient is φ = 51059058648.

The previous prime is 102120999947. The next prime is 102120999961. The reversal of 102120999956 is 659999021201.

It is a junction number, because it is equal to n+sod(n) for n = 102120999898 and 102120999907.

It is a congruent number.

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, 192200 + ... + 491103.

It is an arithmetic number, because the mean of its divisors is an integer number (14893066216).

Almost surely, 2^102120999956 is an apocalyptic number.

It is an amenable number.

102120999956 is a deficient number, since it is larger than the sum of its proper divisors (76595794636).

102120999956 is a wasteful number, since it uses less digits than its factorization.

102120999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720670 (or 720668 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 53.

The spelling of 102120999956 in words is "one hundred two billion, one hundred twenty million, nine hundred ninety-nine thousand, nine hundred fifty-six".