221356422 has 256 divisors, whose sum is σ = 656640000. Its totient is φ = 54867456.

The previous prime is 221356397. The next prime is 221356423. The reversal of 221356422 is 224653122.

It is a happy number.

221356422 is a `hidden beast` number, since 2 + 2 + 13 + 5 + 642 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221356423) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5982588 + ... + 5982624.

It is an arithmetic number, because the mean of its divisors is an integer number (2565000).

Almost surely, 2^221356422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221356422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328320000).

221356422 is an abundant number, since it is smaller than the sum of its proper divisors (435283578).

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

221356422 is a wasteful number, since it uses less digits than its factorization.

221356422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 85 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 221356422 is about 14878.0516869649. The cubic root of 221356422 is about 604.9192087550.

The spelling of 221356422 in words is "two hundred twenty-one million, three hundred fifty-six thousand, four hundred twenty-two".