21334216450516 has 24 divisors (see below), whose sum is σ = 37610307582120. Its totient is φ = 10588426340352.

The previous prime is 21334216450513. The next prime is 21334216450549. The reversal of 21334216450516 is 61505461243312.

It can be written as a sum of positive squares in 4 ways, for example, as 844597760400 + 20489618690116 = 919020^2 + 4526546^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334216450513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5608740 + ... + 8609668.

It is an arithmetic number, because the mean of its divisors is an integer number (1567096149255).

Almost surely, 2^{21334216450516} is an apocalyptic number.

It is an amenable number.

21334216450516 is a deficient number, since it is larger than the sum of its proper divisors (16276091131604).

21334216450516 is a wasteful number, since it uses less digits than its factorization.

21334216450516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014043 (or 3014041 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

Adding to 21334216450516 its reverse (61505461243312), we get a palindrome (82839677693828).

The spelling of 21334216450516 in words is "twenty-one trillion, three hundred thirty-four billion, two hundred sixteen million, four hundred fifty thousand, five hundred sixteen".