21020451300 has 108 divisors (see below), whose sum is σ = 65933811216. Its totient is φ = 5601508800.

The previous prime is 21020451271. The next prime is 21020451301. The reversal of 21020451300 is 315402012.

21020451300 is a `hidden beast` number, since 210 + 2 + 0 + 451 + 3 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21020451301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1406467 + ... + 1421333.

It is an arithmetic number, because the mean of its divisors is an integer number (610498252).

Almost surely, 2^21020451300 is an apocalyptic number.

21020451300 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 21020451300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32966905608).

21020451300 is an abundant number, since it is smaller than the sum of its proper divisors (44913359916).

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

21020451300 is a wasteful number, since it uses less digits than its factorization.

21020451300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16458 (or 16448 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21020451300 its reverse (315402012), we get a palindrome (21335853312).

The spelling of 21020451300 in words is "twenty-one billion, twenty million, four hundred fifty-one thousand, three hundred".