21010021300 has 36 divisors (see below), whose sum is σ = 45598042476. Its totient is φ = 8402848000.

The previous prime is 21010021271. The next prime is 21010021327. The reversal of 21010021300 is 312001012.

It can be written as a sum of positive squares in 6 ways, for example, as 1622800656 + 19387220644 = 40284^2 + 139238^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1383750 + ... + 1398850.

It is an arithmetic number, because the mean of its divisors is an integer number (1266612291).

Almost surely, 2^21010021300 is an apocalyptic number.

21010021300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010021300 is an abundant number, since it is smaller than the sum of its proper divisors (24588021176).

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

21010021300 is a wasteful number, since it uses less digits than its factorization.

21010021300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29028 (or 29021 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21010021300 its reverse (312001012), we get a palindrome (21322022312).

The spelling of 21010021300 in words is "twenty-one billion, ten million, twenty-one thousand, three hundred".