21116206500263 has 16 divisors (see below), whose sum is σ = 24630031480320. Its totient is φ = 17727851090976.

The previous prime is 21116206500241. The next prime is 21116206500353. The reversal of 21116206500263 is 36200560261112.

It is a cyclic number.

It is not a de Polignac number, because 21116206500263 - 2⁸ = 21116206500007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116206200263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48263483 + ... + 48699036.

It is an arithmetic number, because the mean of its divisors is an integer number (1539376967520).

Almost surely, 2^{21116206500263} is an apocalyptic number.

21116206500263 is a deficient number, since it is larger than the sum of its proper divisors (3513824980057).

21116206500263 is an equidigital number, since it uses as much as digits as its factorization.

21116206500263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96963166.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 21116206500263 its reverse (36200560261112), we get a palindrome (57316766761375).

The spelling of 21116206500263 in words is "twenty-one trillion, one hundred sixteen billion, two hundred six million, five hundred thousand, two hundred sixty-three".