21020213200 has 120 divisors (see below), whose sum is σ = 58694189760. Its totient is φ = 7084723200.

The previous prime is 21020213189. The next prime is 21020213251. The reversal of 21020213200 is 231202012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101580 + ... + 228820.

It is an arithmetic number, because the mean of its divisors is an integer number (489118248).

Almost surely, 2^21020213200 is an apocalyptic number.

21020213200 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 21020213200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29347094880).

21020213200 is an abundant number, since it is smaller than the sum of its proper divisors (37673976560).

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

21020213200 is a wasteful number, since it uses less digits than its factorization.

21020213200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127325 (or 127314 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21020213200 its reverse (231202012), we get a palindrome (21251415212).

The spelling of 21020213200 in words is "twenty-one billion, twenty million, two hundred thirteen thousand, two hundred".