197421354109 has 4 divisors (see below), whose sum is σ = 225624404704. Its totient is φ = 169218303516.

The previous prime is 197421354079. The next prime is 197421354199. The reversal of 197421354109 is 901453124791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 197421354109 - 2¹⁵ = 197421321341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197421354199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14101525287 + ... + 14101525300.

It is an arithmetic number, because the mean of its divisors is an integer number (56406101176).

Almost surely, 2^197421354109 is an apocalyptic number.

It is an amenable number.

197421354109 is a deficient number, since it is larger than the sum of its proper divisors (28203050595).

197421354109 is an equidigital number, since it uses as much as digits as its factorization.

197421354109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28203050594.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 197421354109 in words is "one hundred ninety-seven billion, four hundred twenty-one million, three hundred fifty-four thousand, one hundred nine".