197067942771921 has 81 divisors (see below), whose sum is σ = 309264635000529. Its totient is φ = 120868620118272.

The previous prime is 197067942771827. The next prime is 197067942771979. The reversal of 197067942771921 is 129177249760791.

The square root of 197067942771921 is 14038089.

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

197067942771921 is a `hidden beast` number, since 1 + 9 + 7 + 0 + 6 + 7 + 9 + 427 + 7 + 192 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14498663059521 + 182569279712400 = 3807711^2 + 13511820^2 .

It is not a de Polignac number, because 197067942771921 - 2⁹ = 197067942771409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197067942771921.

It is not an unprimeable number, because it can be changed into a prime (197067947771921) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 324658884000 + ... + 324658884606.

Almost surely, 2^{197067942771921} is an apocalyptic number.

197067942771921 is the 14038089-th square number.

197067942771921 is the 7019045-th centered octagonal number.

It is an amenable number.

197067942771921 is a deficient number, since it is larger than the sum of its proper divisors (112196692228608).

197067942771921 is an frugal number, since it uses more digits than its factorization.

197067942771921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432 (or 1216 counting only the distinct ones).

The product of its (nonzero) digits is 168031584, while the sum is 72.

The spelling of 197067942771921 in words is "one hundred ninety-seven trillion, sixty-seven billion, nine hundred forty-two million, seven hundred seventy-one thousand, nine hundred twenty-one".