21200011112220 has 24 divisors (see below), whose sum is σ = 59360031114384. Its totient is φ = 5653336296576.

The previous prime is 21200011112209. The next prime is 21200011112237. The reversal of 21200011112220 is 2221111000212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21200011112220.

It is a congruent number.

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, 176666759209 + ... + 176666759328.

It is an arithmetic number, because the mean of its divisors is an integer number (2473334629766).

Almost surely, 2^{21200011112220} is an apocalyptic number.

21200011112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200011112220 is an abundant number, since it is smaller than the sum of its proper divisors (38160020002164).

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

21200011112220 is a wasteful number, since it uses less digits than its factorization.

21200011112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353333518549 (or 353333518547 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200011112220 its reverse (2221111000212), we get a palindrome (23421122112432).

The spelling of 21200011112220 in words is "twenty-one trillion, two hundred billion, eleven million, one hundred twelve thousand, two hundred twenty".