121972768516 has 81 divisors (see below), whose sum is σ = 227545496199. Its totient is φ = 57206494800.

The previous prime is 121972768499. The next prime is 121972768517. The reversal of 121972768516 is 615867279121.

The square root of 121972768516 is 349246.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121972768517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 931089771 + ... + 931089901.

Almost surely, 2^121972768516 is an apocalyptic number.

121972768516 is the 349246-th square number.

It is an amenable number.

121972768516 is a deficient number, since it is larger than the sum of its proper divisors (105572727683).

121972768516 is an equidigital number, since it uses as much as digits as its factorization.

121972768516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 207 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 55.

The spelling of 121972768516 in words is "one hundred twenty-one billion, nine hundred seventy-two million, seven hundred sixty-eight thousand, five hundred sixteen".