21253054240050 has 96 divisors (see below), whose sum is σ = 53952112558080. Its totient is φ = 5533751630400.

The previous prime is 21253054240027. The next prime is 21253054240069. The reversal of 21253054240050 is 5004245035212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21253054239993 and 21253054240020.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17997295 + ... + 19141805.

It is an arithmetic number, because the mean of its divisors is an integer number (562001172480).

Almost surely, 2^{21253054240050} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21253054240050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26976056279040).

21253054240050 is an abundant number, since it is smaller than the sum of its proper divisors (32699058318030).

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

21253054240050 is a wasteful number, since it uses less digits than its factorization.

21253054240050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147448 (or 1147443 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 21253054240050 its reverse (5004245035212), we get a palindrome (26257299275262).

The spelling of 21253054240050 in words is "twenty-one trillion, two hundred fifty-three billion, fifty-four million, two hundred forty thousand, fifty".