21220213213320 has 192 divisors, whose sum is σ = 70140320953920. Its totient is φ = 5132073408000.

The previous prime is 21220213213307. The next prime is 21220213213337. The reversal of 21220213213320 is 2331231202212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4377235 + ... + 7848605.

It is an arithmetic number, because the mean of its divisors is an integer number (365314171635).

Almost surely, 2^{21220213213320} is an apocalyptic number.

21220213213320 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 21220213213320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35070160476960).

21220213213320 is an abundant number, since it is smaller than the sum of its proper divisors (48920107740600).

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

21220213213320 is a wasteful number, since it uses less digits than its factorization.

21220213213320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471828 (or 3471813 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21220213213320 its reverse (2331231202212), we get a palindrome (23551444415532).

The spelling of 21220213213320 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirteen million, two hundred thirteen thousand, three hundred twenty".