194820690121 has 16 divisors (see below), whose sum is σ = 205348451328. Its totient is φ = 184595846400.

The previous prime is 194820690019. The next prime is 194820690167. The reversal of 194820690121 is 121096028491.

It is a cyclic number.

It is not a de Polignac number, because 194820690121 - 2¹⁷ = 194820559049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194820790121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4165 + ... + 624226.

It is an arithmetic number, because the mean of its divisors is an integer number (12834278208).

Almost surely, 2^194820690121 is an apocalyptic number.

It is an amenable number.

194820690121 is a deficient number, since it is larger than the sum of its proper divisors (10527761207).

194820690121 is a wasteful number, since it uses less digits than its factorization.

194820690121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628632.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 194820690121 in words is "one hundred ninety-four billion, eight hundred twenty million, six hundred ninety thousand, one hundred twenty-one".