194671430021 has 4 divisors (see below), whose sum is σ = 194949136044. Its totient is φ = 194393724000.

The previous prime is 194671429969. The next prime is 194671430029. The reversal of 194671430021 is 120034176491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109501428100 + 85170001921 = 330910^2 + 291839^2 .

It is a cyclic number.

It is not a de Polignac number, because 194671430021 - 2¹⁰ = 194671428997 is a prime.

It is a super-2 number, since 2×194671430021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194671430029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138851960 + ... + 138853361.

It is an arithmetic number, because the mean of its divisors is an integer number (48737284011).

Almost surely, 2^194671430021 is an apocalyptic number.

It is an amenable number.

194671430021 is a deficient number, since it is larger than the sum of its proper divisors (277706023).

194671430021 is an equidigital number, since it uses as much as digits as its factorization.

194671430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277706022.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 194671430021 in words is "one hundred ninety-four billion, six hundred seventy-one million, four hundred thirty thousand, twenty-one".