221206422 has 8 divisors (see below), whose sum is σ = 442412856. Its totient is φ = 73735472.

The previous prime is 221206409. The next prime is 221206457. The reversal of 221206422 is 224602122.

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

221206422 is an admirable number.

It is a super-2 number, since 2×221206422² = 97864562268084168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18433863 + ... + 18433874.

It is an arithmetic number, because the mean of its divisors is an integer number (55301607).

Almost surely, 2^221206422 is an apocalyptic number.

221206422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221206422 is a wasteful number, since it uses less digits than its factorization.

221206422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36867742.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221206422 is about 14873.0098500606. The cubic root of 221206422 is about 604.7825386973.

Adding to 221206422 its reverse (224602122), we get a palindrome (445808544).

The spelling of 221206422 in words is "two hundred twenty-one million, two hundred six thousand, four hundred twenty-two".