21001300104 has 64 divisors (see below), whose sum is σ = 53877384000. Its totient is φ = 6818144256.

The previous prime is 21001300093. The next prime is 21001300169. The reversal of 21001300104 is 40100310012.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21001300104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335472 + ... + 393120.

It is an arithmetic number, because the mean of its divisors is an integer number (841834125).

Almost surely, 2^21001300104 is an apocalyptic number.

21001300104 is a gapful number since it is divisible by the number (24) 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 21001300104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26938692000).

21001300104 is an abundant number, since it is smaller than the sum of its proper divisors (32876083896).

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

21001300104 is a wasteful number, since it uses less digits than its factorization.

21001300104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58054 (or 58050 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21001300104 its reverse (40100310012), we get a palindrome (61101610116).

The spelling of 21001300104 in words is "twenty-one billion, one million, three hundred thousand, one hundred four".