21160351500066 has 24 divisors (see below), whose sum is σ = 45851070605340. Its totient is φ = 7052890137696.

The previous prime is 21160351500023. The next prime is 21160351500121. The reversal of 21160351500066 is 66000515306112.

21160351500066 is a `hidden beast` number, since 2 + 1 + 1 + 60 + 35 + 1 + 500 + 0 + 66 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19088781403041 + 2071570097025 = 4369071^2 + 1439295^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21160351500066.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46463965 + ... + 46917168.

Almost surely, 2^{21160351500066} is an apocalyptic number.

21160351500066 is an abundant number, since it is smaller than the sum of its proper divisors (24690719105274).

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

21160351500066 is a wasteful number, since it uses less digits than its factorization.

21160351500066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93393730 (or 93393727 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

Adding to 21160351500066 its reverse (66000515306112), we get a palindrome (87160866806178).

The spelling of 21160351500066 in words is "twenty-one trillion, one hundred sixty billion, three hundred fifty-one million, five hundred thousand, sixty-six".