194838484021 has 4 divisors (see below), whose sum is σ = 194839719552. Its totient is φ = 194837248492.

The previous prime is 194838483989. The next prime is 194838484039. The reversal of 194838484021 is 120484838491.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120484838491 = 19 ⋅6341307289.

It is a cyclic number.

It is not a de Polignac number, because 194838484021 - 2⁵ = 194838483989 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 194838484021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194838484081) 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, 339415 + ... + 710548.

It is an arithmetic number, because the mean of its divisors is an integer number (48709929888).

Almost surely, 2^194838484021 is an apocalyptic number.

It is an amenable number.

194838484021 is a deficient number, since it is larger than the sum of its proper divisors (1235531).

194838484021 is a wasteful number, since it uses less digits than its factorization.

194838484021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235530.

The product of its (nonzero) digits is 1769472, while the sum is 52.

The spelling of 194838484021 in words is "one hundred ninety-four billion, eight hundred thirty-eight million, four hundred eighty-four thousand, twenty-one".