21011310220 has 12 divisors (see below), whose sum is σ = 44123751504. Its totient is φ = 8404524080.

The previous prime is 21011310217. The next prime is 21011310253. The reversal of 21011310220 is 2201311012.

It is a super-2 number, since 2×21011310220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011310220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525282736 + ... + 525282775.

It is an arithmetic number, because the mean of its divisors is an integer number (3676979292).

Almost surely, 2^21011310220 is an apocalyptic number.

21011310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011310220 is an abundant number, since it is smaller than the sum of its proper divisors (23112441284).

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

21011310220 is a wasteful number, since it uses less digits than its factorization.

21011310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050565520 (or 1050565518 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21011310220 its reverse (2201311012), we get a palindrome (23212621232).

The spelling of 21011310220 in words is "twenty-one billion, eleven million, three hundred ten thousand, two hundred twenty".