221221231022 has 16 divisors (see below), whose sum is σ = 362116749744. Its totient is φ = 100522224000.

The previous prime is 221221231009. The next prime is 221221231027. The reversal of 221221231022 is 220132122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221230985 and 221221231003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221231027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1575179 + ... + 1709862.

It is an arithmetic number, because the mean of its divisors is an integer number (22632296859).

Almost surely, 2^221221231022 is an apocalyptic number.

221221231022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221221231022 is a deficient number, since it is larger than the sum of its proper divisors (140895518722).

221221231022 is a wasteful number, since it uses less digits than its factorization.

221221231022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288115.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221221231022 its reverse (220132122122), we get a palindrome (441353353144).

The spelling of 221221231022 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, twenty-two".