197836357921 has 8 divisors (see below), whose sum is σ = 200160445824. Its totient is φ = 195519433200.

The previous prime is 197836357913. The next prime is 197836357937. The reversal of 197836357921 is 129753638791.

It is a happy number.

197836357921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197836357921 - 2³ = 197836357913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197836357921.

It is not an unprimeable number, because it can be changed into a prime (197836357951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1735225 + ... + 1845718.

It is an arithmetic number, because the mean of its divisors is an integer number (25020055728).

Almost surely, 2^197836357921 is an apocalyptic number.

It is an amenable number.

197836357921 is a deficient number, since it is larger than the sum of its proper divisors (2324087903).

197836357921 is a wasteful number, since it uses less digits than its factorization.

197836357921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581591.

The product of its digits is 17146080, while the sum is 61.

The spelling of 197836357921 in words is "one hundred ninety-seven billion, eight hundred thirty-six million, three hundred fifty-seven thousand, nine hundred twenty-one".