194220421 has 8 divisors (see below), whose sum is σ = 196068600. Its totient is φ = 192381120.

The previous prime is 194220419. The next prime is 194220431. The reversal of 194220421 is 124022491.

It can be written as a sum of positive squares in 4 ways, for example, as 9641025 + 184579396 = 3105^2 + 13586^2 .

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 194220421 - 2¹ = 194220419 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 (194220431) 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 7 ways as a sum of consecutive naturals, for example, 46695 + ... + 50683.

It is an arithmetic number, because the mean of its divisors is an integer number (24508575).

Almost surely, 2^194220421 is an apocalyptic number.

It is an amenable number.

194220421 is a deficient number, since it is larger than the sum of its proper divisors (1848179).

194220421 is a wasteful number, since it uses less digits than its factorization.

194220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4439.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 194220421 is about 13936.2986836534. The cubic root of 194220421 is about 579.1151996592.

The spelling of 194220421 in words is "one hundred ninety-four million, two hundred twenty thousand, four hundred twenty-one".