21165563036514 has 64 divisors (see below), whose sum is σ = 46654457084928. Its totient is φ = 6360084360000.

The previous prime is 21165563036489. The next prime is 21165563036531. The reversal of 21165563036514 is 41563036556112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22312389 + ... + 23241639.

It is an arithmetic number, because the mean of its divisors is an integer number (728975891952).

Almost surely, 2^{21165563036514} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21165563036514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23327228542464).

21165563036514 is an abundant number, since it is smaller than the sum of its proper divisors (25488894048414).

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

21165563036514 is a wasteful number, since it uses less digits than its factorization.

21165563036514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936103.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 21165563036514 in words is "twenty-one trillion, one hundred sixty-five billion, five hundred sixty-three million, thirty-six thousand, five hundred fourteen".