21042011320 has 144 divisors (see below), whose sum is σ = 54927505080. Its totient is φ = 7248320640.

The previous prime is 21042011303. The next prime is 21042011323. The reversal of 21042011320 is 2311024012.

It is a junction number, because it is equal to n+sod(n) for n = 21042011294 and 21042011303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042011323) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1741219 + ... + 1753261.

Almost surely, 2^21042011320 is an apocalyptic number.

21042011320 is a gapful number since it is divisible by the number (20) 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 21042011320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27463752540).

21042011320 is an abundant number, since it is smaller than the sum of its proper divisors (33885493760).

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

21042011320 is a wasteful number, since it uses less digits than its factorization.

21042011320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12114 (or 12080 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21042011320 its reverse (2311024012), we get a palindrome (23353035332).

The spelling of 21042011320 in words is "twenty-one billion, forty-two million, eleven thousand, three hundred twenty".