21220311120 has 80 divisors (see below), whose sum is σ = 69245240640. Its totient is φ = 5360919552.

The previous prime is 21220311109. The next prime is 21220311127. The reversal of 21220311120 is 2111302212.

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

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21220311120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220311127) 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, 2322229 + ... + 2331348.

It is an arithmetic number, because the mean of its divisors is an integer number (865565508).

Almost surely, 2^21220311120 is an apocalyptic number.

21220311120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220311120 is an abundant number, since it is smaller than the sum of its proper divisors (48024929520).

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

21220311120 is a wasteful number, since it uses less digits than its factorization.

21220311120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4653612 (or 4653606 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21220311120 its reverse (2111302212), we get a palindrome (23331613332).

The spelling of 21220311120 in words is "twenty-one billion, two hundred twenty million, three hundred eleven thousand, one hundred twenty".