221194457 has 8 divisors (see below), whose sum is σ = 243647040. Its totient is φ = 199132560.

The previous prime is 221194433. The next prime is 221194469. The reversal of 221194457 is 754491122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221194457 - 2⁸ = 221194201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221194487) 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, 96482 + ... + 98747.

It is an arithmetic number, because the mean of its divisors is an integer number (30455880).

Almost surely, 2^221194457 is an apocalyptic number.

It is an amenable number.

221194457 is a deficient number, since it is larger than the sum of its proper divisors (22452583).

221194457 is a wasteful number, since it uses less digits than its factorization.

221194457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195343.

The product of its digits is 20160, while the sum is 35.

The square root of 221194457 is about 14872.6076059311. The cubic root of 221194457 is about 604.7716343219.

The spelling of 221194457 in words is "two hundred twenty-one million, one hundred ninety-four thousand, four hundred fifty-seven".