21113202524424 has 128 divisors (see below), whose sum is σ = 58914508377600. Its totient is φ = 6266048578560.

The previous prime is 21113202524417. The next prime is 21113202524429. The reversal of 21113202524424 is 42442520231112.

It is not an unprimeable number, because it can be changed into a prime (21113202524429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3385879 + ... + 7327385.

It is an arithmetic number, because the mean of its divisors is an integer number (460269596700).

Almost surely, 2^{21113202524424} is an apocalyptic number.

21113202524424 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 21113202524424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29457254188800).

21113202524424 is an abundant number, since it is smaller than the sum of its proper divisors (37801305853176).

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

21113202524424 is a wasteful number, since it uses less digits than its factorization.

21113202524424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942243 (or 3942239 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

Adding to 21113202524424 its reverse (42442520231112), we get a palindrome (63555722755536).

The spelling of 21113202524424 in words is "twenty-one trillion, one hundred thirteen billion, two hundred two million, five hundred twenty-four thousand, four hundred twenty-four".