221242394 has 8 divisors (see below), whose sum is σ = 332041248. Its totient is φ = 110561980.

The previous prime is 221242337. The next prime is 221242409. The reversal of 221242394 is 493242122.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24782 + ... + 32505.

It is an arithmetic number, because the mean of its divisors is an integer number (41505156).

Almost surely, 2^221242394 is an apocalyptic number.

221242394 is a deficient number, since it is larger than the sum of its proper divisors (110798854).

221242394 is a wasteful number, since it uses less digits than its factorization.

221242394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59220.

The product of its digits is 6912, while the sum is 29.

The square root of 221242394 is about 14874.2191055531. The cubic root of 221242394 is about 604.8153196297.

The spelling of 221242394 in words is "two hundred twenty-one million, two hundred forty-two thousand, three hundred ninety-four".