221222566554 has 48 divisors (see below), whose sum is σ = 490869245664. Its totient is φ = 66410602720.

The previous prime is 221222566553. The next prime is 221222566559. The reversal of 221222566554 is 455665222122.

221222566554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221222566553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1346217 + ... + 1501580.

It is an arithmetic number, because the mean of its divisors is an integer number (10226442618).

Almost surely, 2^221222566554 is an apocalyptic number.

221222566554 is an abundant number, since it is smaller than the sum of its proper divisors (269646679110).

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

221222566554 is a wasteful number, since it uses less digits than its factorization.

221222566554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847931 (or 2847920 counting only the distinct ones).

The product of its digits is 576000, while the sum is 42.

Adding to 221222566554 its reverse (455665222122), we get a palindrome (676887788676).

The spelling of 221222566554 in words is "two hundred twenty-one billion, two hundred twenty-two million, five hundred sixty-six thousand, five hundred fifty-four".