21055300000 has 216 divisors, whose sum is σ = 60285664908. Its totient is φ = 7217280000.

The previous prime is 21055299971. The next prime is 21055300051. The reversal of 21055300000 is 355012.

It can be written as a sum of positive squares in 6 ways, for example, as 2300545296 + 18754754704 = 47964^2 + 136948^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4897852 + ... + 4902148.

Almost surely, 2^21055300000 is an apocalyptic number.

21055300000 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 21055300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30142832454).

21055300000 is an abundant number, since it is smaller than the sum of its proper divisors (39230364908).

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

21055300000 is an frugal number, since it uses more digits than its factorization.

21055300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346 (or 4311 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

Adding to 21055300000 its reverse (355012), we get a palindrome (21055655012).

The spelling of 21055300000 in words is "twenty-one billion, fifty-five million, three hundred thousand".