121908515716 has 45 divisors (see below), whose sum is σ = 231341556201. Its totient is φ = 56211000768.

The previous prime is 121908515699. The next prime is 121908515717. The reversal of 121908515716 is 617515809121.

The square root of 121908515716 is 349154.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 82742522500 + 39165993216 = 287650^2 + 197904^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121908515717) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 118013536 + ... + 118014568.

Almost surely, 2^121908515716 is an apocalyptic number.

121908515716 is the 349154-th square number.

It is an amenable number.

121908515716 is a deficient number, since it is larger than the sum of its proper divisors (109433040485).

121908515716 is an frugal number, since it uses more digits than its factorization.

121908515716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 46.

The spelling of 121908515716 in words is "one hundred twenty-one billion, nine hundred eight million, five hundred fifteen thousand, seven hundred sixteen".