221222456 has 48 divisors (see below), whose sum is σ = 519641640. Its totient is φ = 87514560.

The previous prime is 221222437. The next prime is 221222461. The reversal of 221222456 is 654222122.

221222456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16610 + ... + 26801.

Almost surely, 2^221222456 is an apocalyptic number.

221222456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221222456 is an abundant number, since it is smaller than the sum of its proper divisors (298419184).

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

221222456 is a wasteful number, since it uses less digits than its factorization.

221222456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43444 (or 43433 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 221222456 is about 14873.5488703940. The cubic root of 221222456 is about 604.7971507639.

Adding to 221222456 its reverse (654222122), we get a palindrome (875444578).

The spelling of 221222456 in words is "two hundred twenty-one million, two hundred twenty-two thousand, four hundred fifty-six".