21200121330 has 64 divisors (see below), whose sum is σ = 52314425856. Its totient is φ = 5495040000.

The previous prime is 21200121323. The next prime is 21200121419. The reversal of 21200121330 is 3312100212.

21200121330 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

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 31 ways as a sum of consecutive naturals, for example, 301530 + ... + 365130.

It is an arithmetic number, because the mean of its divisors is an integer number (817412904).

Almost surely, 2^21200121330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200121330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26157212928).

21200121330 is an abundant number, since it is smaller than the sum of its proper divisors (31114304526).

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

21200121330 is a wasteful number, since it uses less digits than its factorization.

21200121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63923.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21200121330 its reverse (3312100212), we get a palindrome (24512221542).

The spelling of 21200121330 in words is "twenty-one billion, two hundred million, one hundred twenty-one thousand, three hundred thirty".