21114243621424 has 80 divisors (see below), whose sum is σ = 44811877972320. Its totient is φ = 9592847953920.

The previous prime is 21114243621421. The next prime is 21114243621437. The reversal of 21114243621424 is 42412634241112.

It is a happy number.

It is a super-2 number, since 2×21114243621424² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21114243621421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129699919 + ... + 129862609.

It is an arithmetic number, because the mean of its divisors is an integer number (560148474654).

Almost surely, 2^{21114243621424} 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 21114243621424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22405938986160).

21114243621424 is an abundant number, since it is smaller than the sum of its proper divisors (23697634350896).

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

21114243621424 is a wasteful number, since it uses less digits than its factorization.

21114243621424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179198 (or 179192 counting only the distinct ones).

The product of its digits is 73728, while the sum is 37.

Adding to 21114243621424 its reverse (42412634241112), we get a palindrome (63526877862536).

The spelling of 21114243621424 in words is "twenty-one trillion, one hundred fourteen billion, two hundred forty-three million, six hundred twenty-one thousand, four hundred twenty-four".