21202321104 has 160 divisors (see below), whose sum is σ = 63622713600. Its totient is φ = 6747586560.

The previous prime is 21202321099. The next prime is 21202321123. The reversal of 21202321104 is 40112320212.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6367312 + ... + 6370640.

It is an arithmetic number, because the mean of its divisors is an integer number (397641960).

Almost surely, 2^21202321104 is an apocalyptic number.

21202321104 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 21202321104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31811356800).

21202321104 is an abundant number, since it is smaller than the sum of its proper divisors (42420392496).

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

21202321104 is a wasteful number, since it uses less digits than its factorization.

21202321104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010 (or 3998 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21202321104 its reverse (40112320212), we get a palindrome (61314641316).

The spelling of 21202321104 in words is "twenty-one billion, two hundred two million, three hundred twenty-one thousand, one hundred four".