21230310103220 has 24 divisors (see below), whose sum is σ = 45424852185384. Its totient is φ = 8331895285376.

The previous prime is 21230310103183. The next prime is 21230310103229. The reversal of 21230310103220 is 2230101303212.

It can be written as a sum of positive squares in 4 ways, for example, as 76731216016 + 21153578887204 = 277004^2 + 4599302^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21230310103192 and 21230310103201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230310103229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10014296159 + ... + 10014298278.

It is an arithmetic number, because the mean of its divisors is an integer number (1892702174391).

Almost surely, 2^{21230310103220} is an apocalyptic number.

21230310103220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230310103220 is an abundant number, since it is smaller than the sum of its proper divisors (24194542082164).

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

21230310103220 is a wasteful number, since it uses less digits than its factorization.

21230310103220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20028594499 (or 20028594497 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21230310103220 its reverse (2230101303212), we get a palindrome (23460411406432).

The spelling of 21230310103220 in words is "twenty-one trillion, two hundred thirty billion, three hundred ten million, one hundred three thousand, two hundred twenty".