21111011112220 has 24 divisors (see below), whose sum is σ = 44385963804000. Its totient is φ = 8434339593792.

The previous prime is 21111011112179. The next prime is 21111011112221. The reversal of 21111011112220 is 2221111011112.

It is a junction number, because it is equal to n+sod(n) for n = 21111011112194 and 21111011112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111011112221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629035995 + ... + 629069554.

It is an arithmetic number, because the mean of its divisors is an integer number (1849415158500).

Almost surely, 2^{21111011112220} is an apocalyptic number.

21111011112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111011112220 is an abundant number, since it is smaller than the sum of its proper divisors (23274952691780).

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

21111011112220 is a wasteful number, since it uses less digits than its factorization.

21111011112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258106397 (or 1258106395 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21111011112220 its reverse (2221111011112), we get a palindrome (23332122123332).

The spelling of 21111011112220 in words is "twenty-one trillion, one hundred eleven billion, eleven million, one hundred twelve thousand, two hundred twenty".