21220104444 has 216 divisors, whose sum is σ = 63958046544. Its totient is φ = 5455296000.

The previous prime is 21220104439. The next prime is 21220104449. The reversal of 21220104444 is 44440102212.

It is an interprime number because it is at equal distance from previous prime (21220104439) and next prime (21220104449).

It is a super-2 number, since 2×21220104444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220104449) 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 71 ways as a sum of consecutive naturals, for example, 7184472 + ... + 7187424.

Almost surely, 2^21220104444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220104444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31979023272).

21220104444 is an abundant number, since it is smaller than the sum of its proper divisors (42737942100).

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

21220104444 is a wasteful number, since it uses less digits than its factorization.

21220104444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097 (or 3077 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21220104444 its reverse (44440102212), we get a palindrome (65660206656).

The spelling of 21220104444 in words is "twenty-one billion, two hundred twenty million, one hundred four thousand, four hundred forty-four".