21001320300 has 36 divisors (see below), whose sum is σ = 60763820936. Its totient is φ = 5600352000.

The previous prime is 21001320289. The next prime is 21001320323. The reversal of 21001320300 is 302310012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35001901 + ... + 35002500.

Almost surely, 2^21001320300 is an apocalyptic number.

21001320300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001320300 is an abundant number, since it is smaller than the sum of its proper divisors (39762500636).

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

21001320300 is a wasteful number, since it uses less digits than its factorization.

21001320300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70004418 (or 70004411 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21001320300 its reverse (302310012), we get a palindrome (21303630312).

The spelling of 21001320300 in words is "twenty-one billion, one million, three hundred twenty thousand, three hundred".