21220122224 has 40 divisors (see below), whose sum is σ = 47063475840. Its totient is φ = 9079616448.

The previous prime is 21220122223. The next prime is 21220122227. The reversal of 21220122224 is 42222102212.

It is a junction number, because it is equal to n+sod(n) for n = 21220122196 and 21220122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220122221) 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, 83714 + ... + 222369.

It is an arithmetic number, because the mean of its divisors is an integer number (1176586896).

Almost surely, 2^21220122224 is an apocalyptic number.

It is an amenable number.

21220122224 is an abundant number, since it is smaller than the sum of its proper divisors (25843353616).

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

21220122224 is a wasteful number, since it uses less digits than its factorization.

21220122224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306717 (or 306711 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21220122224 its reverse (42222102212), we get a palindrome (63442224436).

The spelling of 21220122224 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-four".