21351163502466 has 48 divisors (see below), whose sum is σ = 54159048897408. Its totient is φ = 5951543832000.

The previous prime is 21351163502453. The next prime is 21351163502477. The reversal of 21351163502466 is 66420536115312.

It is a happy number.

21351163502466 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 1 + 1 + 635 + 0 + 2 + 4 + 6 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2066503110 + ... + 2066513441.

It is an arithmetic number, because the mean of its divisors is an integer number (1128313518696).

Almost surely, 2^{21351163502466} is an apocalyptic number.

21351163502466 is an abundant number, since it is smaller than the sum of its proper divisors (32807885394942).

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

21351163502466 is a wasteful number, since it uses less digits than its factorization.

21351163502466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133016607 (or 4133016604 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

Adding to 21351163502466 its reverse (66420536115312), we get a palindrome (87771699617778).

The spelling of 21351163502466 in words is "twenty-one trillion, three hundred fifty-one billion, one hundred sixty-three million, five hundred two thousand, four hundred sixty-six".