21204240222 has 16 divisors (see below), whose sum is σ = 46263796992. Its totient is φ = 6425527320.

The previous prime is 21204240221. The next prime is 21204240223. The reversal of 21204240222 is 22204240212.

It is an interprime number because it is at equal distance from previous prime (21204240221) and next prime (21204240223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204240221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160638118 + ... + 160638249.

It is an arithmetic number, because the mean of its divisors is an integer number (2891487312).

Almost surely, 2^21204240222 is an apocalyptic number.

21204240222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21204240222 is an abundant number, since it is smaller than the sum of its proper divisors (25059556770).

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

21204240222 is a wasteful number, since it uses less digits than its factorization.

21204240222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321276383.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 21204240222 its reverse (22204240212), we get a palindrome (43408480434).

The spelling of 21204240222 in words is "twenty-one billion, two hundred four million, two hundred forty thousand, two hundred twenty-two".