21434307764516 has 12 divisors (see below), whose sum is σ = 37510078475100. Its totient is φ = 10717142485920.

The previous prime is 21434307764477. The next prime is 21434307764521. The reversal of 21434307764516 is 61546770343412.

It can be written as a sum of positive squares in 2 ways, for example, as 15707715183616 + 5726592580900 = 3963296^2 + 2393030^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2497586 + ... + 7007606.

It is an arithmetic number, because the mean of its divisors is an integer number (3125839872925).

Almost surely, 2^{21434307764516} is an apocalyptic number.

It is an amenable number.

21434307764516 is a deficient number, since it is larger than the sum of its proper divisors (16075770710584).

21434307764516 is a wasteful number, since it uses less digits than its factorization.

21434307764516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698174 (or 5698172 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 53.

The spelling of 21434307764516 in words is "twenty-one trillion, four hundred thirty-four billion, three hundred seven million, seven hundred sixty-four thousand, five hundred sixteen".