221222000 has 80 divisors (see below), whose sum is σ = 545268672. Its totient is φ = 86777600.

The previous prime is 221221967. The next prime is 221222009. The reversal of 221222000 is 222122.

221222000 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104957 + ... + 107043.

Almost surely, 2^221222000 is an apocalyptic number.

221222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272634336).

221222000 is an abundant number, since it is smaller than the sum of its proper divisors (324046672).

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

221222000 is a wasteful number, since it uses less digits than its factorization.

221222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163 (or 2147 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 221222000 is about 14873.5335411596. The cubic root of 221222000 is about 604.7967352128.

Adding to 221222000 its reverse (222122), we get a palindrome (221444122).

The spelling of 221222000 in words is "two hundred twenty-one million, two hundred twenty-two thousand".