21210023021320 has 384 divisors, whose sum is σ = 57654531164160. Its totient is φ = 6997676797440.

The previous prime is 21210023021267. The next prime is 21210023021329. The reversal of 21210023021320 is 2312032001212.

It is not an unprimeable number, because it can be changed into a prime (21210023021329) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1613290987 + ... + 1613304133.

It is an arithmetic number, because the mean of its divisors is an integer number (150142008240).

Almost surely, 2^{21210023021320} is an apocalyptic number.

21210023021320 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 21210023021320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28827265582080).

21210023021320 is an abundant number, since it is smaller than the sum of its proper divisors (36444508142840).

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

21210023021320 is a wasteful number, since it uses less digits than its factorization.

21210023021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13513 (or 13502 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210023021320 its reverse (2312032001212), we get a palindrome (23522055022532).

The spelling of 21210023021320 in words is "twenty-one trillion, two hundred ten billion, twenty-three million, twenty-one thousand, three hundred twenty".