159911212321 has 15 divisors (see below), whose sum is σ = 186574842483. Its totient is φ = 137049958080.

The previous prime is 159911212313. The next prime is 159911212367. The reversal of 159911212321 is 123212119951.

The square root of 159911212321 is 399889.

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

It can be written as a sum of positive squares in only one way, i.e., 59092261921 + 100818950400 = 243089^2 + 317520^2 .

It is not a de Polignac number, because 159911212321 - 2³ = 159911212313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159911212921) 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, 19590481 + ... + 19598641.

Almost surely, 2^159911212321 is an apocalyptic number.

159911212321 is the 399889-th square number.

159911212321 is the 199945-th centered octagonal number.

It is an amenable number.

159911212321 is a deficient number, since it is larger than the sum of its proper divisors (26663630162).

159911212321 is an frugal number, since it uses more digits than its factorization.

159911212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16350 (or 8168 counting only the distinct ones).

The product of its digits is 9720, while the sum is 37.

The spelling of 159911212321 in words is "one hundred fifty-nine billion, nine hundred eleven million, two hundred twelve thousand, three hundred twenty-one".