196721971629121 has 9 divisors (see below), whose sum is σ = 200504497343241. Its totient is φ = 193009506975792.

The previous prime is 196721971629119. The next prime is 196721971629163. The reversal of 196721971629121 is 121926179127691.

The square root of 196721971629121 is 14025761.

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

196721971629121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 126889208069121 + 69832763560000 = 11264511^2 + 8356600^2 .

It is not a de Polignac number, because 196721971629121 - 2¹ = 196721971629119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196721971626121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 743233015 + ... + 743497651.

Almost surely, 2^{196721971629121} is an apocalyptic number.

196721971629121 is the 14025761-st square number.

196721971629121 is the 7012881-st centered octagonal number.

It is an amenable number.

196721971629121 is a deficient number, since it is larger than the sum of its proper divisors (3782525714120).

196721971629121 is an frugal number, since it uses more digits than its factorization.

196721971629121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529380 (or 264690 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 64.

The spelling of 196721971629121 in words is "one hundred ninety-six trillion, seven hundred twenty-one billion, nine hundred seventy-one million, six hundred twenty-nine thousand, one hundred twenty-one".