21200300000 has 144 divisors (see below), whose sum is σ = 56914888464. Its totient is φ = 7708800000.

The previous prime is 21200299969. The next prime is 21200300039. The reversal of 21200300000 is 300212.

It is a Harshad number since it is a multiple of its sum of digits (8).

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, 1090364 + ... + 1109636.

It is an arithmetic number, because the mean of its divisors is an integer number (395242281).

Almost surely, 2^21200300000 is an apocalyptic number.

21200300000 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 21200300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28457444232).

21200300000 is an abundant number, since it is smaller than the sum of its proper divisors (35714588464).

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

21200300000 is an equidigital number, since it uses as much as digits as its factorization.

21200300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19319 (or 19291 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

Adding to 21200300000 its reverse (300212), we get a palindrome (21200600212).

The spelling of 21200300000 in words is "twenty-one billion, two hundred million, three hundred thousand".