21331211104 has 96 divisors (see below), whose sum is σ = 49600567296. Its totient is φ = 8836853760.

The previous prime is 21331211071. The next prime is 21331211113. The reversal of 21331211104 is 40111213312.

It is a congruent number.

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, 10574704 + ... + 10576720.

It is an arithmetic number, because the mean of its divisors is an integer number (516672576).

Almost surely, 2^21331211104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21331211104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24800283648).

21331211104 is an abundant number, since it is smaller than the sum of its proper divisors (28269356192).

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

21331211104 is a wasteful number, since it uses less digits than its factorization.

21331211104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588 (or 3580 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21331211104 its reverse (40111213312), we get a palindrome (61442424416).

The spelling of 21331211104 in words is "twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, one hundred four".