21340250351420 has 192 divisors, whose sum is σ = 60180793344000. Its totient is φ = 6138807229440.

The previous prime is 21340250351419. The next prime is 21340250351447. The reversal of 21340250351420 is 2415305204312.

It is a super-2 number, since 2×21340250351420² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121613906 + ... + 121789254.

It is an arithmetic number, because the mean of its divisors is an integer number (313441632000).

Almost surely, 2^{21340250351420} is an apocalyptic number.

21340250351420 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 21340250351420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30090396672000).

21340250351420 is an abundant number, since it is smaller than the sum of its proper divisors (38840542992580).

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

21340250351420 is a wasteful number, since it uses less digits than its factorization.

21340250351420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181468 (or 181466 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21340250351420 its reverse (2415305204312), we get a palindrome (23755555555732).

The spelling of 21340250351420 in words is "twenty-one trillion, three hundred forty billion, two hundred fifty million, three hundred fifty-one thousand, four hundred twenty".