21063551450344 has 128 divisors (see below), whose sum is σ = 45108646732800. Its totient is φ = 9153225400320.

The previous prime is 21063551450203. The next prime is 21063551450467. The reversal of 21063551450344 is 44305415536012.

It is a self number, because there is not a number n which added to its sum of digits gives 21063551450344.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17880154 + ... + 19021750.

It is an arithmetic number, because the mean of its divisors is an integer number (352411302600).

Almost surely, 2^{21063551450344} 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 21063551450344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22554323366400).

21063551450344 is an abundant number, since it is smaller than the sum of its proper divisors (24045095282456).

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

21063551450344 is a wasteful number, since it uses less digits than its factorization.

21063551450344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141803 (or 1141799 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

Adding to 21063551450344 its reverse (44305415536012), we get a palindrome (65368966986356).

The spelling of 21063551450344 in words is "twenty-one trillion, sixty-three billion, five hundred fifty-one million, four hundred fifty thousand, three hundred forty-four".