221022456 has 64 divisors (see below), whose sum is σ = 596505600. Its totient is φ = 68035968.

The previous prime is 221022407. The next prime is 221022469. The reversal of 221022456 is 654220122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9105 + ... + 22911.

It is an arithmetic number, because the mean of its divisors is an integer number (9320400).

Almost surely, 2^221022456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221022456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298252800).

221022456 is an abundant number, since it is smaller than the sum of its proper divisors (375483144).

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

221022456 is a wasteful number, since it uses less digits than its factorization.

221022456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13868 (or 13864 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 221022456 is about 14866.8240051465. The cubic root of 221022456 is about 604.6148366919.

Adding to 221022456 its reverse (654220122), we get a palindrome (875242578).

The spelling of 221022456 in words is "two hundred twenty-one million, twenty-two thousand, four hundred fifty-six".