21001323300 has 72 divisors (see below), whose sum is σ = 60788775936. Its totient is φ = 5598053760.

The previous prime is 21001323221. The next prime is 21001323307. The reversal of 21001323300 is 332310012.

It is a super-2 number, since 2×21001323300² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21001323300.

It is not an unprimeable number, because it can be changed into a prime (21001323307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 793074 + ... + 819126.

Almost surely, 2^21001323300 is an apocalyptic number.

21001323300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001323300 is an abundant number, since it is smaller than the sum of its proper divisors (39787452636).

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

21001323300 is a wasteful number, since it uses less digits than its factorization.

21001323300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28757 (or 28750 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21001323300 its reverse (332310012), we get a palindrome (21333633312).

The spelling of 21001323300 in words is "twenty-one billion, one million, three hundred twenty-three thousand, three hundred".