21116200535 has 4 divisors (see below), whose sum is σ = 25339440648. Its totient is φ = 16892960424.

The previous prime is 21116200513. The next prime is 21116200541. The reversal of 21116200535 is 53500261112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21116200535 - 2¹⁴ = 21116184151 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2111620049 + ... + 2111620058.

It is an arithmetic number, because the mean of its divisors is an integer number (6334860162).

Almost surely, 2^21116200535 is an apocalyptic number.

21116200535 is a deficient number, since it is larger than the sum of its proper divisors (4223240113).

21116200535 is an equidigital number, since it uses as much as digits as its factorization.

21116200535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223240112.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 21116200535 its reverse (53500261112), we get a palindrome (74616461647).

The spelling of 21116200535 in words is "twenty-one billion, one hundred sixteen million, two hundred thousand, five hundred thirty-five".