120019980721 has 3 divisors (see below), whose sum is σ = 120020327161. Its totient is φ = 120019634282.

The previous prime is 120019980697. The next prime is 120019980727. The reversal of 120019980721 is 127089910021.

The square root of 120019980721 is 346439.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 120019980721 - 2⁹ = 120019980209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120019980727) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 173220 + ... + 519658.

Almost surely, 2^120019980721 is an apocalyptic number.

120019980721 is the 346439-th square number.

120019980721 is the 173220-th centered octagonal number.

It is an amenable number.

120019980721 is a deficient number, since it is larger than the sum of its proper divisors (346440).

120019980721 is an frugal number, since it uses more digits than its factorization.

120019980721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692878 (or 346439 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 120019980721 in words is "one hundred twenty billion, nineteen million, nine hundred eighty thousand, seven hundred twenty-one".