21110011011220 has 24 divisors (see below), whose sum is σ = 45859679094600. Its totient is φ = 8152831838592.

The previous prime is 21110011011163. The next prime is 21110011011253. The reversal of 21110011011220 is 2211011001112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 517619813764 + 20592391197456 = 719458^2 + 4537884^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21110011011220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18198284775 + ... + 18198285934.

It is an arithmetic number, because the mean of its divisors is an integer number (1910819962275).

Almost surely, 2^{21110011011220} is an apocalyptic number.

21110011011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110011011220 is an abundant number, since it is smaller than the sum of its proper divisors (24749668083380).

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

21110011011220 is a wasteful number, since it uses less digits than its factorization.

21110011011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36396570747 (or 36396570745 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110011011220 its reverse (2211011001112), we get a palindrome (23321022012332).

The spelling of 21110011011220 in words is "twenty-one trillion, one hundred ten billion, eleven million, eleven thousand, two hundred twenty".