221644422 has 48 divisors (see below), whose sum is σ = 503912448. Its totient is φ = 70274160.

The previous prime is 221644417. The next prime is 221644439. The reversal of 221644422 is 224446122.

221644422 is a `hidden beast` number, since 2 + 216 + 4 + 442 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77673 + ... + 80475.

It is an arithmetic number, because the mean of its divisors is an integer number (10498176).

Almost surely, 2^221644422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221644422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251956224).

221644422 is an abundant number, since it is smaller than the sum of its proper divisors (282268026).

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

221644422 is a wasteful number, since it uses less digits than its factorization.

221644422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025 (or 3022 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 221644422 is about 14887.7272274851. The cubic root of 221644422 is about 605.1814422893.

The spelling of 221644422 in words is "two hundred twenty-one million, six hundred forty-four thousand, four hundred twenty-two".