194421321 has 6 divisors (see below), whose sum is σ = 280830810. Its totient is φ = 129614208.

The previous prime is 194421313. The next prime is 194421329. The reversal of 194421321 is 123124491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (194421313) and next prime (194421329).

It can be written as a sum of positive squares in only one way, i.e., 107931321 + 86490000 = 10389^2 + 9300^2 .

It is not a de Polignac number, because 194421321 - 2³ = 194421313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194421329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10801176 + ... + 10801193.

It is an arithmetic number, because the mean of its divisors is an integer number (46805135).

Almost surely, 2^194421321 is an apocalyptic number.

It is an amenable number.

194421321 is a deficient number, since it is larger than the sum of its proper divisors (86409489).

194421321 is a wasteful number, since it uses less digits than its factorization.

194421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21602375 (or 21602372 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 194421321 is about 13943.5046168458. The cubic root of 194421321 is about 579.3148081776.

The spelling of 194421321 in words is "one hundred ninety-four million, four hundred twenty-one thousand, three hundred twenty-one".