21116220260 has 24 divisors (see below), whose sum is σ = 44347031736. Its totient is φ = 8445922560.

The previous prime is 21116220239. The next prime is 21116220287. The reversal of 21116220260 is 6202261112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26790976 + 21089429284 = 5176^2 + 145222^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404030 + ... + 453290.

It is an arithmetic number, because the mean of its divisors is an integer number (1847792989).

Almost surely, 2^21116220260 is an apocalyptic number.

21116220260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21116220260 is an abundant number, since it is smaller than the sum of its proper divisors (23230811476).

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

21116220260 is a wasteful number, since it uses less digits than its factorization.

21116220260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70703 (or 70701 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21116220260 its reverse (6202261112), we get a palindrome (27318481372).

The spelling of 21116220260 in words is "twenty-one billion, one hundred sixteen million, two hundred twenty thousand, two hundred sixty".