194106821 has 8 divisors (see below), whose sum is σ = 202743744. Its totient is φ = 185486400.

The previous prime is 194106817. The next prime is 194106827. The reversal of 194106821 is 128601491.

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 194106821 - 2² = 194106817 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 (194106827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24110 + ... + 31136.

It is an arithmetic number, because the mean of its divisors is an integer number (25342968).

Almost surely, 2^194106821 is an apocalyptic number.

It is an amenable number.

194106821 is a deficient number, since it is larger than the sum of its proper divisors (8636923).

194106821 is a wasteful number, since it uses less digits than its factorization.

194106821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8251.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 194106821 is about 13932.2223998901. Note that the first 3 decimals coincide. The cubic root of 194106821 is about 579.0022690055.

The spelling of 194106821 in words is "one hundred ninety-four million, one hundred six thousand, eight hundred twenty-one".