21220103120 has 80 divisors (see below), whose sum is σ = 52638113088. Its totient is φ = 7927695360.

The previous prime is 21220103077. The next prime is 21220103129. The reversal of 21220103120 is 2130102212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 21220103095 and 21220103104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220103129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118607 + ... + 237713.

Almost surely, 2^21220103120 is an apocalyptic number.

21220103120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220103120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26319056544).

21220103120 is an abundant number, since it is smaller than the sum of its proper divisors (31418009968).

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

21220103120 is a wasteful number, since it uses less digits than its factorization.

21220103120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119268 (or 119262 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21220103120 its reverse (2130102212), we get a palindrome (23350205332).

The spelling of 21220103120 in words is "twenty-one billion, two hundred twenty million, one hundred three thousand, one hundred twenty".