21320460535466 has 16 divisors (see below), whose sum is σ = 32214695067720. Its totient is φ = 10582507921920.

The previous prime is 21320460535459. The next prime is 21320460535469. The reversal of 21320460535466 is 66453506402312.

It can be written as a sum of positive squares in 4 ways, for example, as 16195964385241 + 5124496150225 = 4024421^2 + 2263735^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21320460535466.

It is not an unprimeable number, because it can be changed into a prime (21320460535469) 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, 69615851 + ... + 69921438.

Almost surely, 2^{21320460535466} is an apocalyptic number.

21320460535466 is a deficient number, since it is larger than the sum of its proper divisors (10894234532254).

21320460535466 is a wasteful number, since it uses less digits than its factorization.

21320460535466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139537849.

The product of its (nonzero) digits is 3110400, while the sum is 47.

Adding to 21320460535466 its reverse (66453506402312), we get a palindrome (87773966937778).

The spelling of 21320460535466 in words is "twenty-one trillion, three hundred twenty billion, four hundred sixty million, five hundred thirty-five thousand, four hundred sixty-six".