221858222 has 4 divisors (see below), whose sum is σ = 332787336. Its totient is φ = 110929110.

The previous prime is 221858213. The next prime is 221858249. The reversal of 221858222 is 222858122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222858122 = 2 ⋅111429061.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55464554 + ... + 55464557.

It is an arithmetic number, because the mean of its divisors is an integer number (83196834).

Almost surely, 2^221858222 is an apocalyptic number.

221858222 is a deficient number, since it is larger than the sum of its proper divisors (110929114).

221858222 is a wasteful number, since it uses less digits than its factorization.

221858222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110929113.

The product of its digits is 10240, while the sum is 32.

The square root of 221858222 is about 14894.9059077256. The cubic root of 221858222 is about 605.3759673920.

The spelling of 221858222 in words is "two hundred twenty-one million, eight hundred fifty-eight thousand, two hundred twenty-two".